System and method for simulating urban river ecological restoration based on data

Abstract

The invention provides a system and a method for simulating urban river ecological restoration based on data, and belongs to the technical field of data simulation and ecological restoration. The method comprises the following steps: S100, determining a to-be-restored target section river channel based on existing geographical measured data; s200, determining a plurality of river channel ecological restoration schemes based on the geographical measured data of the to-be-restored target section river channel; s300, for each river channel ecological restoration scheme, generating corresponding simulation restoration data; s400, combining the simulated restoration data with the geographical actual measurement data of the upstream / downstream of the target section river channel, and judging the reliability of each river channel ecological restoration scheme; and S500, screening out a target ecological restoration scheme for the to-be-restored target section river channel based on the reliability. A system for implementing the method is also disclosed. According to the method, the optimal restoration scheme which most conforms to the actually measured data can be formulated for urban river ecological restoration based on the data simulation and three-dimensional modeling technology.

Description

Technical Field

[0001] The present invention belongs to the technical field of data simulation and ecological restoration, and in particular relates to a system and method for ecological restoration of urban rivers based on data simulation. Background Art

[0002] In nature, rivers, seas, lakes and other water channels are mostly naturally curved due to the impact of natural water flow, which conforms to the natural law of the evolution of meandering river bends. However, with the development of urbanization, humans began to intervene in the natural environment, resulting in the change of the shapes of many originally curved rivers. For example, in order to facilitate the passage of ships, the original curved river channel in a certain section was artificially straightened into a straight river channel; considering the intensive use of land in urban planning, the original river channel mudflats were excavated and the water flow was forced to be diverted to a straight line; and for the needs of flood control, the ecological environment of the original river channel was directly transformed, the river bottom was uniformly leveled, and the river bank was flush, etc., which directly changed the natural form of the original river channel.

[0003] With the increasing awareness of ecological and environmental protection, the disadvantages of the above transformation have gradually emerged. First, the river channel is shortened and the water area is reduced, resulting in a decline in climate regulation capacity, and at the same time, a reduction in aquatic habitats, affecting biological diversity and degrading the river ecosystem; second, after the transformation, the river channel is straight, the water flow is fast, and the sediment deposition is reduced, resulting in a reduction in river nutrients and a reduction in aquatic life, as well as a shrinkage of the accumulation landform along the river and a decline in soil fertility; third, when a flood occurs, the fast water flow also causes the flood peak of the downstream river section to arrive early, causing huge pressure on downstream flood control; at the same time, the excessively fast water flow also leads to the strengthening of river erosion, an increase in the sand content of the river, and a reduction in the water quality of the river.

[0004] Based on the above problems, it has become a new trend to carry out ecological restoration of rivers, especially urban rivers, to make them winding, diverse water flows, and both fast and slow ecological landscape rivers.

[0005] However, since the original available area of ​​the natural river may no longer exist and cannot be directly restored to its original natural appearance, it is necessary to redesign the restoration plan to change the straight channel into a bend. However, for a section of the river to be restored, there may be more than one bend design plan. The design plan of the bend after restoration also needs to consider the ecological impact on the upstream / downstream after actual operation, flood control impact and other possible defects. At this time, how to detect whether the current river needs to be repaired and give the best and most practical reliable urban river ecological restoration plan becomes a technical problem that needs to be solved. Summary of the invention

[0006] The technical solution of the present invention is proposed in view of the technical problems raised by the above-mentioned background technology.

[0007] In a first aspect of the present invention, a method for simulating urban river ecological restoration based on data is proposed, the method comprising the following steps:

[0008] S100: Determine the target river section to be restored based on the existing geographical measured data;

[0009] S200: Determine multiple river ecological restoration plans based on geographical measured data of the target river section to be restored;

[0010] S300: For each river ecological restoration plan, generate corresponding simulation restoration data;

[0011] S400: combining the simulated restoration data with geographical measured data of the upstream / downstream of the target section of the river to determine the reliability of each river ecological restoration plan;

[0012] S500: Screening out a target ecological restoration plan for the target river section to be restored based on reliability.

[0013] The geographical measured data includes river channel sampling data values ​​at a plurality of continuous sampling points;

[0014] The step S100 determines the target river section to be repaired based on the existing geographical measured data, and specifically includes:

[0015] If the change rate of the river channel sampling data values ​​of N consecutive sampling points is lower than the preset change rate threshold, the river channel section where the N consecutive points are located will be taken as the target river channel section to be repaired, N>3.

[0016] The river channel sampling data values ​​of the plurality of continuous sampling points include one of the following or any combination thereof:

[0017] The water flow temporal and spatial characteristic values ​​of multiple continuous river bottom sampling point height values, multiple continuous river bank sampling points, and multiple continuous river water area sampling points; the water flow temporal and spatial characteristic values ​​include flow velocity, water depth, turbulence / advection.

[0018] The step S400 specifically includes:

[0019] S410: Based on the geographical measured data of the upstream of the target section river channel and the simulated restoration data, outputting the first spatiotemporal potential characteristic value of the water flow in the target section river channel and the second spatiotemporal potential characteristic value of the water flow in the downstream of the target section river channel through a data simulation model;

[0020] S420: Determine the reliability of the river ecological restoration plan based on the first water flow spatiotemporal potential characteristic value and the second water flow spatiotemporal potential characteristic value.

[0021] The step S200 determines multiple river ecological restoration schemes based on the geographical measured data of the target river section to be restored, including:

[0022] Changing the bottom height of the target section of the river to be repaired and / or changing the riverbank direction of the target section of the river to be repaired.

[0023] In a second aspect of the present invention, in order to implement the method described in the first aspect, a system for simulating urban river ecological restoration based on data is proposed, the system comprising:

[0024] A geographical measured data acquisition module, used to acquire geographical measured data of the urban river, wherein the geographical measured data includes river sampling data values ​​of a plurality of continuous sampling points of the urban river;

[0025] A river channel sampling data value change rate calculation module is used to calculate the numerical change rate of the river channel sampling data values ​​of a set number of continuous sampling points of the urban river channel;

[0026] A target repair section determination module is used to determine the target section of the river to be repaired according to the value change rate calculated by the river sampling data value change rate calculation module;

[0027] A river channel ecological restoration scheme determination module is used to determine multiple river channel ecological restoration schemes based on geographical measured data of the target river section to be restored;

[0028] A simulation restoration data generation module is used to generate corresponding simulation restoration data for each river ecological restoration plan;

[0029] A reliability calculation module is used to combine the simulated restoration data with the geographical measured data of the upstream / downstream of the target section of the river to determine the reliability of each river ecological restoration plan;

[0030] The target ecological restoration scheme screening module is used to screen out the target ecological restoration scheme for the target section of the river to be restored based on reliability.

[0031] The target repair section determination module determines the target section of the river to be repaired according to the value change rate calculated by the river sampling data value change rate calculation module, specifically including:

[0032] If the change rate of the river channel sampling data values ​​of N consecutive sampling points calculated by the river channel sampling data value change rate calculation module is lower than the preset change rate threshold, the target repair section determination module will take the river channel interval where the N consecutive points are located as the target section of the river to be repaired, N>3.

[0033] The river channel sampling data values ​​of the plurality of continuous sampling points include one of the following or any combination thereof:

[0034] The water flow temporal and spatial characteristic values ​​of multiple continuous river bottom sampling point height values, multiple continuous river bank sampling points, and multiple continuous river water area sampling points; the water flow temporal and spatial characteristic values ​​include flow velocity, water depth, turbulence / advection.

[0035] The reliability calculation module combines the simulated restoration data with the geographical measured data of the upstream / downstream of the target section of the river to determine the reliability of each river ecological restoration plan, specifically including:

[0036] Based on the geographical measured data of the upstream of the target section river channel and the simulated restoration data, outputting the first spatiotemporal potential characteristic value of the water flow in the target section river channel and the second spatiotemporal potential characteristic value of the water flow in the downstream of the target section river channel through the data simulation model;

[0037] The reliability of the river ecological restoration plan is determined based on the first water flow spatiotemporal potential characteristic value and the second water flow spatiotemporal potential characteristic value.

[0038] The data simulation models include a shallow water flow model, a MI KE numerical simulation model, and an ANSYS finite element analysis model.

[0039] The technical solution of the present invention at least solves the following technical problems:

[0040] (1) How to detect whether the current river channel needs to be repaired: The present invention is based on existing geographical measured data, preferably from the natural urban river channel that has been transformed, and determines whether the current urban river channel needs to be repaired based on the current measured data;

[0041] (2) For each river to be restored, multiple river ecological restoration plans can be determined based on actual conditions;

[0042] (3) For multiple candidate river ecological restoration plans, evaluation modeling is performed based on data simulation methods to generate simulated restoration data, and then the reliability of each river ecological restoration plan is judged, and finally the optimal and most practical reliable urban river ecological restoration plan is determined.

[0043] (4) The data simulation method is based on the ANSYS finite element analysis model, combined with the shallow water flow model and the MI KE numerical simulation model, which can fully and realistically visualize the data effect and conform to the actual situation.

[0044] Further advantages of the present invention will be further reflected in detail in the specific embodiments section in conjunction with the drawings of the specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0046] Figure 1 This is a schematic diagram of a natural curved river being transformed into a straight channel.

[0047] Figure 2 This is a schematic diagram of the main process of a method for urban river ecological restoration based on data simulation in one embodiment of the present invention.

[0048] Figure 3 This is a schematic diagram of the natural morphology of a city's river before reconstruction and multiple continuous sampling points of the river after reconstruction.

[0049] Figure 4 This is a schematic diagram of the target river section to be restored and its corresponding river ecological restoration plan

[0050] Figure 5 This is a three-dimensional visualization diagram of numerical simulation after ecological restoration of a city's river channel.

[0051] Figure 6 This is a schematic diagram of the functional modules of a data-based urban river ecological restoration system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0052] See first Figure 1 , Figure 1 Schematic diagram showing a naturally curved river channel being transformed into a straight channel.

[0053] Figure 1 Used to explain the background technology of the technical solution of this application and the starting point for improvements of related technical solutions.

[0054] As described in the background technology, due to the impact of natural water flow, most of the water channel areas of rivers, seas, lakes and other water channels in nature are naturally curved, which conforms to the natural law of the evolution of meandering rivers and bends, that is, Figure 1 The schematic diagram of the "original curved river channel" and "old river channel" on the left side of the middle (the original natural river channel area). In order to save land, the later urban planning transformed the curved river channel in this area into a straight river channel ( Figure 1 The original planning intention was that the land in the original natural river area could continue to be used after the transformation.

[0055] However, this transformation may cause many disadvantages in the later stage, which have been described in detail in the background technology part and will not be repeated here.

[0056] In response to this drawback, the present application proposes multiple embodiments to gradually solve the above technical problems. It should be noted that the present application subsequently provides multiple embodiments, each of which can constitute an independent technical solution and may contribute to the prior art and solve the corresponding technical problems. However, it should be pointed out that different embodiments can be combined with each other without violating logic; at the same time, each embodiment can solve at least one technical problem mentioned in the background technology, but it is not required that each individual embodiment solves multiple or all technical problems.

[0057] Figure 2 It is a schematic diagram of the main process of a method for ecological restoration of urban rivers based on data simulation according to an embodiment of the present invention.

[0058] Figure 2 The method of urban river ecological restoration based on data simulation can be implemented through a computer program on an electronic device or system equipped with a memory and a processor. The electronic device or system can be in the form of a physical machine, a virtual machine, a server, a cluster, or any combination thereof.

[0059] Preferably, considering the implementation scenario of the technical solution of this application, Figure 2 The method can be implemented by using a portable handheld terminal with a wireless communication module. The method includes steps S100-S500, and each step is specifically implemented as follows:

[0060] S100: Determine the target river section to be restored based on the existing geographical measured data;

[0061] S200: Determine multiple river ecological restoration plans based on geographical measured data of the target river section to be restored;

[0062] S300: For each river ecological restoration plan, generate corresponding simulation restoration data;

[0063] S400: combining the simulated restoration data with geographical measured data of the upstream / downstream of the target section of the river to determine the reliability of each river ecological restoration plan;

[0064] S500: Screening out a target ecological restoration plan for the target river section to be restored based on reliability.

[0065] The above steps are the specific process. Next, combine Figure 3-Figure 4 The preferred implementation methods of each step are introduced in detail.

[0066] The first step is step S100: based on the existing geographical measured data, determine the target section of the river to be repaired.

[0067] Step S100 solves the technical problem of how to detect whether the current river channel needs to be repaired.

[0068] It is understandable that the rivers that may need to be repaired are mainly those that were originally natural rivers and were later artificially transformed. However, not all artificially transformed rivers need to be repaired. Some artificially transformed rivers have already taken subsequent ecological impacts into consideration during the transformation, and the transformed rivers themselves have also maintained the original ecological environment as much as possible. At this time, such artificially transformed rivers do not need to be repaired.

[0069] Therefore, in the embodiment of the present invention, whether the current river channel needs to be repaired is mainly determined from the following aspects:

[0070] (1) The original shape of the current river channel is curved, and it is artificially transformed into a straight channel (for example, for land conservation needs), and the change rate of the river channel sampling data values ​​of multiple consecutive sampling points in the straight channel area is continuously lower than the preset threshold;

[0071] (2) The original shape of the current river channel is a straight channel, but there are many mudflats in the river channel, and the riverbed bottom is uneven. In order to meet other needs such as flood control and navigation, the middle of the river channel is hollowed out and the riverbed bottom is unified and flat, resulting in significant changes in the water flow characteristics of the river channel in this area compared to before the transformation;

[0072] (3) The current river channel has not been artificially modified, but the water flow characteristics of the downstream or upstream of the current river channel meet the restoration conditions after artificial modification. For various reasons, the upstream or downstream area cannot be restored (the restoration conditions are not met and construction cannot be started). In this case, the current river channel may need to be restored to adjust the water flow characteristics of the upstream or downstream.

[0073] Regardless of the standard or situation, in order to facilitate the automatic implementation of the technical solution and the implementation by means of computer programs, in this embodiment, step S100 can be specifically implemented as follows:

[0074] The geographical measured data includes river channel sampling data values ​​at a plurality of continuous sampling points;

[0075] If the change rate of the river channel sampling data values ​​of N consecutive sampling points is lower than the preset change rate threshold, the river channel section where the N consecutive points are located will be taken as the target river channel section to be repaired, N>3.

[0076] According to relevant ecological protection standards and industry consensus, the embodiments of the present invention select river areas that lack ecological diversity, water area variability, and geomorphic polymorphism after artificial transformation as areas to be restored.

[0077] Specifically, the ecological diversity, water area variability, and geomorphic polymorphism are characterized by river sampling data values ​​at multiple consecutive sampling points;

[0078] As an example, the river channel sampling data values ​​of the plurality of continuous sampling points include one of the following or any combination thereof:

[0079] The water flow temporal and spatial characteristic values ​​of multiple continuous river bottom sampling point height values, multiple continuous river bank sampling points, and multiple continuous river water area sampling points; the water flow temporal and spatial characteristic values ​​include flow velocity, water depth, turbulence / advection.

[0080] It can be understood that the above-mentioned river channel sampling data values ​​are only preferred examples, and those skilled in the art can also select other sampling data values ​​according to actual conditions. Next, the above-mentioned indicators are specifically described:

[0081] (1) Ecological diversity: Ecological diversity is reflected in the water environment, generally referring to sediment deposition, nutrient content, aquatic organism species, etc. The most intuitive indicator can be sediment sampling values, including sediment layers, specific compound concentration values, aquatic organism / plankton species, etc.

[0082] Taking the concentration value of a specific compound as an example, if the concentration value of a specific compound does not change significantly in the sampling values ​​of multiple sampling points, it means that the water area is basically in a dead water or static water state, and does not meet the basic ecological cycle, water purification and other characteristics. The specific compounds may include nitrogen / phosphorus / potassium or others; similarly, the water quality change values ​​of multiple sampling points can also be used as the river sampling data value.

[0083] In this standard, river sampling data values ​​include preset compound concentration values, water quality values, aquatic organisms / plankton species, etc.;

[0084] (2) Variability of water area: Variability of water area mainly reflects the degree of change in the curvature of the water area in the river section, which is mainly the spatiotemporal characteristic values ​​of water flow; the spatiotemporal characteristic values ​​of water flow include flow velocity, water depth, turbulence / advection. Generally speaking, the flow velocity, water depth, turbulence / advection of natural winding river areas will change, or at least change alternately, and will not remain static within a large range. If the flow and water depth of a long section are basically unchanged, and / or there is no turbulence at multiple sampling points, and / or there is advection at multiple sampling points, it is also likely to mean that the water area is basically in a dead water or static water state, and does not meet the basic ecological cycle, water purification and other characteristics;

[0085] (3) Geomorphic polymorphism: Geomorphic diversity is mainly reflected in riverbanks and riverbeds. The riverbank should be appropriately curved and meandering, and the riverbed bottom should be staggered. If the long section of the riverbank is a straight section and the long section of the riverbed is a uniform flat height, it is obviously artificially modified and does not meet the ecological cycle standards. This indicator is specifically reflected in: the height values ​​of multiple continuous riverbed bottom sampling points and the line segments formed by multiple continuous riverbank sampling points.

[0086] When the rate of change of the height values ​​of multiple consecutive riverbed sampling points is lower than a preset rate of change threshold, and / or the rate of change of the direction of a line segment formed by multiple consecutive riverbank sampling points is lower than a preset direction of change threshold, there may be a section that needs to be repaired.

[0087] Therefore, the river channel sampling data values ​​of the multiple continuous sampling points included in the geographical measured data in step S100 can be at least:

[0088] The height values ​​of multiple continuous river bottom sampling points, the line segments formed by multiple continuous river bank sampling points, and the spatiotemporal characteristic values ​​of water flow and the water area monitoring index values ​​of multiple continuous river water area sampling points; the spatiotemporal characteristic values ​​of water flow include flow velocity, water depth, turbulence / advection; the water area monitoring index values ​​include sediment layer (type) value, specific compound concentration value, aquatic organism / plankton species number value, water quality measurement value, etc.

[0089] by Figure 3 For example, Figure 3 The upper part is the landform of a natural river before it was transformed. It can be seen that the natural river is winding, there are mudflats in the middle of the river, and there are many branches in the lower reaches of the river.

[0090] Figure 3 The lower part is a schematic diagram of the river after artificial transformation. After the transformation, the curved river channel including the middle mudflat was directly straightened and filled, becoming a straight river bank structure.

[0091] Moreover, through multiple sampling points at different locations (river bank, riverbed, river water) Figure 3 The multiple sampling values ​​obtained from some sampling points (A, B, C, E, F) include:

[0092] (1) Line segments formed by multiple continuous riverbank sampling points: AB, BC, ...

[0093] (2) Height values ​​of multiple consecutive sampling points at the bottom of the river: E / F;

[0094] (3) The spatiotemporal characteristics of water flow and water monitoring index values ​​at multiple continuous sampling points in river waters.

[0095] If the change rate of the river channel sampling data values ​​of multiple consecutive sampling points is lower than the preset change rate threshold, the river channel section where the multiple consecutive points are located will be taken as the target section of the river channel to be repaired.

[0096] Next, the process proceeds to step S200: based on the geographical measured data of the target river section to be restored, a plurality of river ecological restoration plans are determined.

[0097] The preferred river ecological restoration plan is of course to repair the target section of the river to be repaired, such as changing the bottom height of the target section of the river to be repaired and / or changing the riverbank direction of the target section of the river to be repaired.

[0098] In some special cases, the target river section to be repaired currently no longer meets the conditions for restoration. In this case, the river ecological restoration plan is changed to repair the upstream or downstream river (which meets the conditions for restoration) of the target river section to be repaired currently.

[0099] Regardless of whether the repair is for the currently determined target section of the river to be repaired, or for the upstream or downstream river (which meets the repair conditions) of the currently determined target section of the river to be repaired, there are multiple possible repair plans to choose from.

[0100] For example, changing the river bank direction of the target section of the river to be repaired means changing the straight area into a curved area, but changing the straight area into a curved area can also determine different degrees of curvature, number of curvatures, etc.; changing the bottom height of the target section of the river to be repaired also includes determining the level of the bottom height, the number of mudflats, etc.

[0101] Figure 4 A schematic diagram showing the target river section Lm to be restored and its corresponding river ecological restoration plan O. Figure 4 In the figure, the target river section Lm to be restored is a straight area, and the river ecological restoration plan O is to restore the straight area into a curve, which has set parameters such as arc, curvature, radius, and arc length.

[0102] Therefore, the next step is to proceed to step S300: for each river ecological restoration plan, generate corresponding simulation restoration data.

[0103] The purpose of generating simulated repair data is to simulate the feasibility and reliability of the repair plan through computer.

[0104] Feasibility means that the restoration plan must meet current objective conditions, including geomorphic conditions, economic cost constraints, etc.; reliability means that after the restoration plan is embedded, it will not bring new ecological and geomorphic damage to upstream and downstream areas.

[0105] Specifically, proceed to step S400: combine the simulated restoration data with the geographical measured data of the upstream / downstream of the target section of the river to determine the reliability of each river ecological restoration plan.

[0106] When implemented through a portable computer device, based on the geographical measured data upstream of the target section river channel and the simulated restoration data, the first water flow spatiotemporal potential characteristic value of the target section river channel and the second water flow spatiotemporal potential characteristic value downstream of the target section river channel can be output through a data simulation model.

[0107] The specific data simulation models include shallow water flow model, MICKE numerical simulation model and ANSYS finite element analysis model.

[0108] Next, we will introduce the process of data simulation through computer programs:

[0109] Firstly, based on the ANSYS finite element analysis model, the simulated repair data and the geographical measured data of the upstream / downstream of the target section river channel are combined to construct the simulated three-dimensional structural grid map of the target section river channel to be repaired and the actual three-dimensional structural grid map of the upstream / downstream of the target section river channel (taking the repair of the target section river channel to be repaired as an example).

[0110] ANSYS finite element analysis uses mathematical approximation methods to simulate real physical systems (geometry and load conditions), and uses simple and interactive elements (units) to approximate real systems with infinite unknown quantities with a finite number of unknown quantities. ANSYS software is a large-scale general finite element analysis software that integrates structural, fluid, thermal, electric field, magnetic field, and acoustic field analysis.

[0111] The basic idea of ​​the finite element method is to divide the continuum into a finite number of units using a grid to form a discrete structure, which is used to replace the original continuous structure, so as to better perform stress and strain analysis.

[0112] If the nonlinear constitutive equations of soil (river bank, riverbed) and water (hydrodynamics) are considered and finite element analysis is performed on the target section of the river to be repaired and its upstream / downstream using ANSYS, the target section of the river to be repaired and its upstream / downstream can be divided into many small units. After inputting relevant known or simulated variables, the stress and strain of each unit can be calculated, thereby obtaining the simulated three-dimensional structural grid diagram of the target section of the river to be repaired and the actual three-dimensional structural grid diagram of the upstream / downstream of the target section of the river.

[0113] Related literature on ANSYS finite element analysis can be found in:

[0114] [1] Li Huokun, Wang Gang, Wei Bowen, et al. Inversion method of dynamic elastic modulus of arch dam prototype based on sensitivity analysis and particle swarm algorithm [J]. Journal of Hydraulic Engineering, 2020, 51(11): 1401-1411.

[0115] [2] Qin Yumei. Design of new pressure flood control structure and ANSYS finite element analysis[J]. Haihe Water Conservancy, 2024, (01): 71-73+83.

[0116] [3] Cui Manqiang. Application of ANSYS numerical simulation for slope ecological restoration[J]. Water Science and Engineering Technology, 2012, (03): 46-48. DO I: 10.19733 / j.cnki.1672-9900.2012.03.021.

[0117] Next, we will enter the shallow water flow model, which is the hydrodynamic simulation process. The unique life activities of river organisms make them have specific requirements for water flow conditions, such as water depth, flow rate, flow rate and flow state. Water depth characterizes the spatial characteristics of fish swimming freely. Too shallow water will hinder fish swimming and foraging. Flow rate is very important for many species because the flow rate is related to the way food and nutrients are provided, and it also defines the ability of organisms to stay and survive in the river section.

[0118] A new approach to river ecological restoration is to adjust the flow characteristics of rivers to improve river ecological conditions by studying the relationship between water flow conditions and ecological conditions. Based on the ecological hydraulic characteristics of aquatic organisms, a suitable flow field environment can be artificially created to promote the growth and proliferation of aquatic organisms, protect endangered species, and restore disturbed rivers to a near-natural state.

[0119] Known continuity equations for water flow include:

[0120]

[0121] The known equations of motion for water flow include:

[0122]

[0123] Where x and y are Cartesian coordinates; t is the time variable, η is the water level, h is the total water depth, and h = d + η, d is the still water depth, is the average velocity in depth in the x and y directions, τ bx , τ by is the bottom stress in the x and y directions, ρ0 is the density of water, g is the local gravitational acceleration, T xx , T yy , T xy is the horizontal viscous stress term.

[0124] Related literature includes:

[0125] [4] Wang Jiasong, He Yousheng. High-resolution computational model of shallow water flow and pollutant diffusion[J]. Applied Mathematics and Mechanics, 2002, (07): 661-666.

[0126] [5] Liu Jiajiao. Numerical simulation of hydrodynamics and water quality of the main stream of Songhua River in Harbin[D]. Harbin Normal University, 2015.

[0127] [6] Wu Hao, Xia Zhonghua. Design and implementation of hydraulic simulation computing platform based on mathematical model[J]. Water Conservancy Informatization, 2018, (01): 50-52+58. DOI: 10.19364 / j.1674-9405.2018.01.011.

[0128] Finally, we enter the MIKE numerical simulation model stage. The MIKE numerical simulation model platform integrates professional hydraulic mathematical model software such as the MIKE 2016 series and 3EWATER, and can perform modeling and calculations in various professional fields such as water resources, water environment, urban pipe networks, groundwater, floods, water conservancy projects, and sediment.

[0129] In this embodiment, based on the geographical measured data of the upstream of the target section river channel and the simulated restoration data, the first spatiotemporal potential characteristic value of the water flow in the target section river channel and the second spatiotemporal potential characteristic value of the water flow in the downstream of the target section river channel are output through the data simulation model;

[0130] Specifically, after inputting the geographical measured data of the upstream of the target section river into the simulated three-dimensional structural grid map of the target section river to be repaired and the actual three-dimensional structural grid map of the upstream / downstream of the target section river, the shallow water flow model and the MIKE numerical simulation model are run to obtain the first water flow spatiotemporal potential characteristic value of the target section river and the second water flow spatiotemporal potential characteristic value of the upstream / downstream of the target section river.

[0131] The MIKE numerical simulation model can be used to simulate water flow, waves, sediment and water environment problems in rivers, lakes, estuaries, bays, coasts and oceans, and can output flood slope overflow phenomena, lake and reservoir environmental evaluation and other element values. MIKE 21's two-dimensional hydrodynamics, convection diffusion, water quality ecology, sand transport, mud transport, and pre- and post-processing and animation simulation functions are used to improve computing efficiency and display computing results.

[0132] Related literature includes:

[0133] [7] Chen Yandong. Numerical simulation study on river ecological restoration[J]. Applied Technology of Soil and Water Conservation

[0134] 2023,(05):25-26.

[0135] [8] Liu Jingjing, Xie Weike, Zhang Bo, et al. Numerical simulation of actual gravel filter bed flow characteristics based on MI KE 21: Taking a river ecological restoration project in Hanzhong City as an example [J]. Environmental Engineering, 2021, 39(01).

[0136] Preferably, the first spatiotemporal potential characteristic value of the water flow in the target section of the river includes the simulated water velocity, water depth and other water flow characteristic values ​​(advection / turbulence), the highest water level and the lowest water level value at multiple sampling points; it may also include the distribution direction of the line segment formed by multiple sampling points simulating the river bank, etc.; the second spatiotemporal potential characteristic value of the water flow in the upstream / downstream of the target section of the river mainly focuses on phenomena such as flood peak, sediment transport, pollution diffusion, and flood control capacity. Of course, the first spatiotemporal potential characteristic value of the water flow and the second spatiotemporal potential characteristic value of the water flow are interrelated and may be repeated. The technical personnel in this field can determine which data features or phenomena or elements need to be paid attention to based on the key elements that need to be paid attention to in the river before and after the transformation. The above-mentioned MI KE numerical simulation model itself can also provide a variety of optional data attention items for users to choose.

[0137] Correspondingly, the first water flow spatiotemporal potential characteristic value includes part or all of the river channel sampling data value in step S100; the second water flow spatiotemporal potential characteristic value includes part or all of the river channel sampling data value in step S100.

[0138] Specifically, the first water flow spatiotemporal potential characteristic value includes the water flow spatiotemporal characteristic value and the water area monitoring index value; the second water flow spatiotemporal potential characteristic value includes the flood peak value, sediment layer value, pollution diffusion range value, flood control capacity value, etc.

[0139] After obtaining the first water flow spatiotemporal potential characteristic value and the second water flow spatiotemporal potential characteristic value, proceed to step S500: determining the reliability of the river ecological restoration plan based on the first water flow spatiotemporal potential characteristic value and the second water flow spatiotemporal potential characteristic value.

[0140] As an example, when the first water flow spatiotemporal potential characteristic value and the second water flow spatiotemporal potential characteristic value both represent that the simulation results of a river ecological restoration plan meet relevant standards such as flood control and environmental governance, then the river ecological restoration plan is a reliable plan.

[0141] After the target ecological restoration plan is determined in step S500, the target ecological restoration plan is applied, and a three-dimensional visualization diagram of numerical simulation after river ecological restoration is output again based on the aforementioned data simulation model.

[0142] As an example, Figure 5 The figure shows a three-dimensional visualization diagram of numerical simulation after ecological restoration of a city's river. The data simulation method is based on the ANSYS finite element analysis model, combined with the shallow water flow model and the MI KE numerical simulation model, which can fully realize the realistic visualization data effect and conform to the actual situation.

[0143] Based on the above method embodiment, a system embodiment corresponding to the method embodiment is introduced next.

[0144] It is understandable that the relevant principles and advantages of the system embodiment are the same as the relevant principles and advantages of the method embodiment described in detail above, so they are not repeated here.

[0145] See also Figure 6 , Figure 6 It is a schematic diagram of the functional module composition of a data-based simulation urban river ecological restoration system according to an embodiment of the present invention.

[0146] exist Figure 6 The system includes a geographic measured data acquisition module, a river channel sampling data value change rate calculation module, a target restoration section determination module, a river channel ecological restoration plan determination module, a simulation restoration data generation module, a reliability calculation module, and a target ecological restoration plan screening module;

[0147] The specific implementation of each functional module is as follows:

[0148] A geographical measured data acquisition module, used to acquire geographical measured data of the urban river, wherein the geographical measured data includes river sampling data values ​​of a plurality of continuous sampling points of the urban river;

[0149] A river channel sampling data value change rate calculation module is used to calculate the numerical change rate of the river channel sampling data values ​​of a set number of continuous sampling points of the urban river channel;

[0150] A target repair section determination module is used to determine the target section of the river to be repaired according to the value change rate calculated by the river sampling data value change rate calculation module;

[0151] A river channel ecological restoration scheme determination module is used to determine multiple river channel ecological restoration schemes based on geographical measured data of the target river section to be restored;

[0152] A simulation restoration data generation module is used to generate corresponding simulation restoration data for each river ecological restoration plan;

[0153] A reliability calculation module is used to combine the simulated restoration data with the geographical measured data of the upstream / downstream of the target section of the river to determine the reliability of each river ecological restoration plan;

[0154] The target ecological restoration scheme screening module is used to screen out the target ecological restoration scheme for the target section of the river to be restored based on reliability.

[0155] Furthermore, the target repair section determination module determines the target section of the river to be repaired according to the value change rate calculated by the river sampling data value change rate calculation module, specifically including:

[0156] If the change rate of the river channel sampling data values ​​of N consecutive sampling points calculated by the river channel sampling data value change rate calculation module is lower than the preset change rate threshold, the target repair section determination module will take the river channel interval where the N consecutive points are located as the target section of the river to be repaired, N>3.

[0157] The river channel sampling data values ​​of the plurality of continuous sampling points include one of the following or any combination thereof:

[0158] The water flow temporal and spatial characteristic values ​​of multiple continuous river bottom sampling point height values, multiple continuous river bank sampling points, and multiple continuous river water area sampling points; the water flow temporal and spatial characteristic values ​​include flow velocity, water depth, turbulence / advection.

[0159] The reliability calculation module combines the simulated restoration data with the geographical measured data of the upstream / downstream of the target section of the river to determine the reliability of each river ecological restoration plan, specifically including:

[0160] Based on the geographical measured data of the upstream of the target section river channel and the simulated restoration data, outputting the first spatiotemporal potential characteristic value of the water flow in the target section river channel and the second spatiotemporal potential characteristic value of the water flow in the downstream of the target section river channel through the data simulation model;

[0161] The reliability of the river ecological restoration plan is determined based on the first water flow spatiotemporal potential characteristic value and the second water flow spatiotemporal potential characteristic value.

[0162] The data simulation models include a shallow water flow model, a MI KE numerical simulation model, and an ANSYS finite element analysis model.

[0163] In summary, the present invention is based on existing geographical measured data, preferably from the natural urban river channel that has been transformed, and judges whether the current urban river channel needs to be repaired based on the current measured data; for each river channel to be repaired, multiple river channel ecological restoration plans can be determined according to the actual situation; for multiple candidate river channel ecological restoration plans, after evaluation modeling based on the data simulation method, simulated restoration data is generated, and then the reliability of each river channel ecological restoration plan is judged, and finally the optimal and most practical reliable urban river channel ecological restoration plan is determined. The data simulation method uses the ANSYS finite element analysis model as the basis, combined with the shallow water flow model and the MI KE numerical simulation model, which can fully and realistically visualize the data effect and conform to the actual situation.

[0164] In the embodiments of the present application, the term "module" or "unit" refers to a computer program or a part of a computer program with a predetermined function, and works together with other related parts to achieve a predetermined goal, and can be implemented in whole or in part by using software, hardware (such as processing circuits or memories) or a combination thereof. Similarly, a processor (or multiple processors or memories) can be used to implement one or more modules or units. In addition, each module or unit can be part of an overall module or unit that includes the function of the module or unit.

[0165] At the same time, in the specific implementation of this application, if user-related data is involved, when the embodiment of this application is applied to a specific product or technology, the user's permission or consent must be obtained, and the collection, use and processing of relevant data must comply with relevant laws, regulations and standards of relevant countries and regions.

[0166] Other technologies, principles, algorithms or models not elaborated in detail in this application can be referred to in the prior art. The prior art cited in the embodiments is an integral part of the disclosure of the present invention.

[0167] The foregoing has shown and described the method embodiments and system of the present invention, but it is understandable to those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for simulating urban river ecological restoration based on data, characterized in that: The method comprises the following steps: S100: Determine the target river section to be restored based on the existing geographical measured data; S200: Determine multiple river ecological restoration plans based on geographical measured data of the target river section to be restored; S300: For each river ecological restoration plan, generate corresponding simulation restoration data; S400: combining the simulated restoration data with geographical measured data of the upstream / downstream of the target section of the river to determine the reliability of each river ecological restoration plan; S500: Screening out a target ecological restoration plan for the target river section to be restored based on reliability.

2. A method for urban river ecological restoration based on data simulation as claimed in claim 1, characterized in that: The geographical measured data includes river channel sampling data values ​​at a plurality of continuous sampling points; The step S100 determines the target river section to be repaired based on the existing geographical measured data, and specifically includes: If the change rate of the river channel sampling data values ​​of N consecutive sampling points is lower than the preset change rate threshold, the river channel section where the N consecutive points are located will be taken as the target river channel section to be repaired, N>3.

3. A method for urban river ecological restoration based on data simulation as claimed in claim 2, characterized in that: The river channel sampling data values ​​of the plurality of continuous sampling points include one of the following or any combination thereof: The water flow temporal and spatial characteristic values ​​of multiple continuous river bottom sampling point height values, multiple continuous river bank sampling points, and multiple continuous river water area sampling points; the water flow temporal and spatial characteristic values ​​include flow velocity, water depth, turbulence / advection.

4. A method for urban river ecological restoration based on data simulation as claimed in claim 1, characterized in that: The step S400 specifically includes: S410: Based on the geographical measured data of the upstream of the target section river channel and the simulated restoration data, outputting the first spatiotemporal potential characteristic value of the water flow in the target section river channel and the second spatiotemporal potential characteristic value of the water flow in the downstream of the target section river channel through a data simulation model; S420: Determine the reliability of the river ecological restoration plan based on the first water flow spatiotemporal potential characteristic value and the second water flow spatiotemporal potential characteristic value.

5. A method for urban river ecological restoration based on data simulation as claimed in claim 3, characterized in that: The step S200 determines multiple river ecological restoration schemes based on the geographical measured data of the target river section to be restored, including: Changing the bottom height of the target section of the river to be repaired and / or changing the riverbank direction of the target section of the river to be repaired.

6. A system for simulating urban river ecological restoration based on data, characterized in that: The system comprises: A geographical measured data acquisition module, used to acquire geographical measured data of the urban river, wherein the geographical measured data includes river sampling data values ​​of a plurality of continuous sampling points of the urban river; A river channel sampling data value change rate calculation module is used to calculate the numerical change rate of the river channel sampling data values ​​of a set number of continuous sampling points of the urban river channel; A target repair section determination module is used to determine the target section of the river to be repaired according to the value change rate calculated by the river sampling data value change rate calculation module; A river channel ecological restoration scheme determination module is used to determine multiple river channel ecological restoration schemes based on geographical measured data of the target river section to be restored; A simulation restoration data generation module is used to generate corresponding simulation restoration data for each river ecological restoration plan; A reliability calculation module is used to combine the simulated restoration data with the geographical measured data of the upstream / downstream of the target section of the river to determine the reliability of each river ecological restoration plan; The target ecological restoration scheme screening module is used to screen out the target ecological restoration scheme for the target section of the river to be restored based on reliability.

7. A system for simulating urban river ecological restoration based on data as claimed in claim 6, characterized in that: The target repair section determination module determines the target section of the river to be repaired according to the value change rate calculated by the river sampling data value change rate calculation module, specifically including: If the change rate of the river channel sampling data values ​​of N consecutive sampling points calculated by the river channel sampling data value change rate calculation module is lower than the preset change rate threshold, the target repair section determination module will take the river channel interval where the N consecutive points are located as the target section of the river to be repaired, N>3.

8. A system for simulating urban river ecological restoration based on data as claimed in claim 6, characterized in that: The river channel sampling data values ​​of the plurality of continuous sampling points include one of the following or any combination thereof: The water flow temporal and spatial characteristic values ​​of multiple continuous river bottom sampling point height values, multiple continuous river bank sampling points, and multiple continuous river water area sampling points; the water flow temporal and spatial characteristic values ​​include flow velocity, water depth, turbulence / advection.

9. The system for simulating urban river ecological restoration based on data as claimed in claim 6, characterized in that: The reliability calculation module combines the simulated restoration data with the geographical measured data of the upstream / downstream of the target section of the river to determine the reliability of each river ecological restoration plan, specifically including: Based on the geographical measured data of the upstream of the target section river channel and the simulated restoration data, outputting the first spatiotemporal potential characteristic value of the water flow in the target section river channel and the second spatiotemporal potential characteristic value of the water flow in the downstream of the target section river channel through the data simulation model; The reliability of the river ecological restoration plan is determined based on the first water flow spatiotemporal potential characteristic value and the second water flow spatiotemporal potential characteristic value.

10. A system for simulating urban river ecological restoration based on data as claimed in claim 9, characterized in that: The data simulation models include a shallow water flow model, a MIKE numerical simulation model, and an ANSYS finite element analysis model.

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