A method and system for optimizing the calculation of sediment transport ratio in a multi-pond area

Abstract

The present application provides a kind of multi-pit pond area sediment transport ratio optimization calculation method and system, it is related to water and soil conservation and sediment transport technical field, method includes obtaining the grid data (such as type, area, water storage capacity, hydraulic residence time and hydrological characteristics) of pit pond;Calculate sediment interception efficiency and flow delay factor;Optimize confluence time;Iterative calculation of sediment transport influence;Optimize sediment transport ratio.The present application improves the accuracy of sediment transport prediction, reflects the unique characteristics of multi-pit pond area, and provides support for watershed sediment management.

Description

Technical Field

[0001] This invention relates to the fields of soil and water conservation and sediment transport technology, and in particular to a method and system for optimizing the sediment transport ratio in multi-pit pond areas. Background Technology

[0002] The Sediment Delivery Ratio (SDR) is a key parameter in Sediment Delivery Distributed Models (SEDD) and other related models. It describes the efficiency of sediment transport from the source region to the water body outlet and is widely used in fields such as soil erosion, pollutant transport, water resource management, and environmental protection. By calculating the SDR, sediment flow within a watershed can be effectively predicted, aiding in the development of soil and water conservation and water quality protection measures.

[0003] However, in many watersheds, especially in areas with numerous ponds, these ponds have a significant impact on sediment transport. Ponds slow down water flow by retaining water and intercepting sediment, thereby altering the transport path and velocity of sediment. Existing sediment transport models often do not adequately consider the influence of ponds, resulting in low accuracy in calculating sediment transport ratios. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, the purpose of this invention is to provide a method and system for optimizing the calculation of sediment transport ratio in multi-pond areas. By combining the effects of water flow delay, sediment interception, and the cumulative effect of multi-pond systems, the calculation of sediment transport ratio is optimized, thus making up for the deficiencies of existing models.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] A method for optimizing the sediment transport ratio in multi-pit pond areas includes:

[0007] Obtain raster data of at least one pond within the watershed; the raster data includes: pond type, pond area, water storage capacity, hydraulic retention time, and watershed hydrological characteristics;

[0008] The sediment interception efficiency of each pit is determined based on the type and area of ​​the pit.

[0009] The flow delay factor of the pit is determined based on the hydraulic residence time of the pit, and the flow delay effect of the pit is considered. The original confluence time is optimized according to the flow delay factor to obtain the optimized confluence time.

[0010] Based on the optimized confluence time and the sediment interception efficiency, the impact of each pit on sediment transport is iteratively calculated, and the sediment concentration is updated level by level.

[0011] Taking into account the cumulative effects of the flow delay factor and the sediment interception effect, the initial sediment transport ratio during the stepwise sediment concentration update process is optimized to obtain the optimized sediment transport ratio.

[0012] Preferably, the types of ponds include: artificial aquaculture ponds, landscape ponds, and natural ponds.

[0013] Preferably, the formula for calculating the sediment interception efficiency is:

[0014]

[0015] Among them, E j Let A be the sediment interception efficiency of the j-th pit, k be a preset area influence coefficient, and A be the sediment interception efficiency of the j-th pit. j Let be the area of ​​the j-th pit.

[0016] Preferably, the formula for calculating the water flow delay factor is:

[0017]

[0018] Among them, A j Let V be the area of ​​the j-th pit. j Let D be the water storage capacity of the j-th pond. j Let be the water flow delay factor for the j-th pit.

[0019] Preferably, the formula for calculating the optimized merging time is:

[0020]

[0021] Among them, T i D is the original convergence time. j Let be the water flow delay factor for the j-th pond. To optimize the merging time.

[0022] Preferably, the formula for calculating the initial sediment transport ratio is:

[0023]

[0024] in, To optimize the initial sediment transport ratio of the i-th pixel, For the optimized merging time, E j Let β be the sediment interception efficiency of the j-th pit, and β be an empirical coefficient used to describe the rate of decay of sediment transport efficiency.

[0025] Preferably, the formula for calculating the optimized sediment transport ratio is:

[0026]

[0027] in, For the optimized sediment transport ratio, β is an empirical coefficient used to describe the rate of decline in sediment transport efficiency. For the optimized merging time, A j Let V be the area of ​​the j-th pit. j Let E be the water storage capacity of the j-th pond. j Let be the sediment interception efficiency of the j-th pit.

[0028] A system for optimizing sediment transport ratio in multi-pit pond areas includes:

[0029] The data acquisition unit is used to acquire raster data of at least one pond within the watershed; the raster data includes: pond type, pond area, water storage capacity, hydraulic retention time, and watershed hydrological characteristics;

[0030] An efficiency determination unit is used to determine the sediment interception efficiency of each pit based on the pit type and the pit area.

[0031] The time optimization unit is used to determine the water flow delay factor of the pit based on the hydraulic residence time of the pit, and to optimize the original confluence time according to the water flow delay factor to obtain the optimized confluence time.

[0032] The iterative calculation unit is used to iteratively calculate the impact of each pit on sediment transport based on the optimized confluence time and the sediment interception efficiency, and update the sediment concentration step by step.

[0033] The result optimization unit is used to comprehensively consider the cumulative effects of the water flow delay factor and the sediment interception effect to optimize the initial sediment transport ratio in the process of progressively updating sediment concentration, and obtain the optimized sediment transport ratio.

[0034] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0035] This invention provides a method and system for optimizing the sediment transport ratio in a multi-pond area, comprising: acquiring raster data of at least one pond within a watershed; the raster data including: pond type, pond area, water storage capacity, hydraulic retention time, and watershed hydrological characteristics; determining the sediment interception efficiency of each pond based on the pond type and pond area; determining the flow delay factor of each pond based on the hydraulic retention time, and considering the flow delay effect of the pond, optimizing the original confluence time based on the flow delay factor to obtain an optimized confluence time; iteratively calculating the impact of each pond on sediment transport based on the optimized confluence time and the sediment interception efficiency, and updating the sediment concentration level by level; comprehensively considering the cumulative effect of the flow delay factor and the cumulative effect of the sediment interception effect, optimizing the initial sediment transport ratio during the level-by-level sediment concentration update process to obtain the optimized sediment transport ratio. This invention not only improves the accuracy of sediment transport prediction but also reflects the unique sediment transport characteristics of multi-pond areas. This invention can provide strong support for watershed sediment management and has broad application prospects. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 A flowchart of the method provided in an embodiment of the present invention;

[0038] Figure 2 This is a schematic diagram illustrating the implementation process of the calculation method provided in the embodiments of the present invention;

[0039] Figure 3 This is a schematic diagram of the system structure provided in an embodiment of the present invention. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] The purpose of this invention is to provide a method and system for optimizing the sediment transport ratio in multi-pit pond areas, which can provide strong support for watershed sediment management and has broad application prospects.

[0042] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0043] Figure 1 The method flowchart provided in the embodiments of the present invention is as follows: Figure 1 As shown, this invention provides a method for optimizing the sediment transport ratio in multi-pit pond areas, comprising:

[0044] Step 100: Obtain raster data for at least one pond within the watershed; the raster data includes: pond type, pond area, water storage capacity, hydraulic retention time, and watershed hydrological characteristics;

[0045] Step 200: Determine the sediment interception efficiency of each pit based on its type and area;

[0046] Step 300: Determine the flow delay factor of the pond based on the hydraulic residence time of the pond, and consider the flow delay effect of the pond. Optimize the original confluence time according to the flow delay factor to obtain the optimized confluence time.

[0047] Step 400: Based on the optimization of confluence time and sediment interception efficiency, iteratively calculate the impact of each pit on sediment transport and update the sediment concentration step by step;

[0048] Step 500: Taking into account the cumulative effects of the water flow delay factor and the sediment interception effect, the initial sediment transport ratio in the process of progressively updating sediment concentration is optimized to obtain the optimized sediment transport ratio.

[0049] This invention provides a method for optimizing the calculation of sediment transport ratio (SDR) in multi-pond areas. By introducing the water flow delay effect, sediment interception effect, and cumulative interception effect of the ponds, the method optimizes the sediment transport calculation in the traditional SEDD model, especially the key parameter of sediment transport ratio. The innovations of this method are mainly reflected in the following aspects:

[0050] Specifically, in the original SEDD model, the formula for calculating the sediment transport ratio (SDR) is:

[0051] SDR i =exp(-β·T) i (1)

[0052] SDR i Let T be the sediment transport ratio of the i-th pixel, β be an empirical coefficient describing the rate of decay of sediment transport efficiency, and T be the sediment transport ratio of the i-th pixel. i The original convergence time is from the i-th pixel to the watershed outlet.

[0053] Optionally, the optimized formula for calculating the sediment transport ratio (initial sediment transport ratio) takes into account the water flow delay effect and sediment interception effect in the pond. The optimized formula is:

[0054]

[0055] To optimize the sediment transport ratio of the i-th pixel, To optimize the convergence time, considering the delay effect of the crater, E j Let be the sediment interception efficiency of the j-th pit.

[0056] Furthermore, in this embodiment, the water flow delay effect is the optimized confluence time (optimized confluence time). Water flow delay factor D j The revised formula is as follows:

[0057]

[0058] Among them, T i D is the original convergence time. j Let be the water flow delay factor for the j-th pit.

[0059] Specifically, in this embodiment, the water flow delay factor D of the pond is... j It can be calculated using the following formula:

[0060]

[0061] Among them, A j Let V be the area (m2) of the j-th pit. j Let be the water storage capacity (m3) of the j-th pit.

[0062] Optionally, the sediment interception rate E of the pit / pond j Depending on the type of pond, namely artificial aquaculture ponds, landscape ponds, and natural ponds, the specific calculation formula is as follows:

[0063]

[0064] Where k is the area influence coefficient, which is usually an empirical value.

[0065] Specifically, this embodiment takes all factors into account, and the formula for calculating the optimized sediment transport ratio (optimized sediment transport ratio) is as follows:

[0066]

[0067] in, To optimize the sediment transport ratio, the effects of water flow delay and sediment interception were considered. The cumulative effect of the water flow delay factor in the pit / pond. This refers to the cumulative effect of sediment interception in pits and ponds.

[0068] Furthermore, the optimization advantages of this embodiment are as follows:

[0069] (1) Flow delay effect: By considering the impact of the flow delay of pits and ponds on sediment transport, the model can more accurately reflect the role of pits and ponds in the watershed.

[0070] (2) Sediment interception effect: The interception efficiency of pits and ponds is introduced, and the interception capacity of each pit and pond for sediment is dynamically adjusted.

[0071] (3) Cumulative effect: The delay and interception effects of multiple pits along the water flow path are superimposed step by step, which improves the model's simulation accuracy of the actual situation of the watershed.

[0072] like Figure 2 As shown, the calculation method of the present invention can be implemented through the following steps:

[0073] (1) Obtain raster data of ponds and pits in the watershed, including information such as pond type, area, and water storage capacity.

[0074] (2) Calculate the sediment interception efficiency of each pit based on its type and area.

[0075] (3) Based on the hydraulic residence time of the pit, calculate the flow delay factor and optimize the confluence time.

[0076] (4) Calculate the impact of each pit on sediment transport step by step based on the water flow delay and interception effect, and update the sediment concentration on the path.

[0077] Corresponding to the above methods, such as Figure 3 As shown, this embodiment also provides a system for optimizing the sediment transport ratio in multi-pit pond areas, including:

[0078] The data acquisition unit is used to acquire raster data of at least one pond within the watershed; the raster data includes: pond type, pond area, water storage capacity, hydraulic retention time, and watershed hydrological characteristics;

[0079] An efficiency determination unit is used to determine the sediment interception efficiency of each pit based on the pit type and the pit area.

[0080] The time optimization unit is used to determine the water flow delay factor of the pit based on the hydraulic residence time of the pit, and to optimize the original confluence time according to the water flow delay factor to obtain the optimized confluence time.

[0081] The iterative calculation unit is used to iteratively calculate the impact of each pit on sediment transport based on the optimized confluence time and the sediment interception efficiency, and update the sediment concentration step by step.

[0082] The result optimization unit is used to comprehensively consider the cumulative effects of the water flow delay factor and the sediment interception effect to optimize the initial sediment transport ratio in the process of progressively updating sediment concentration, and obtain the optimized sediment transport ratio.

[0083] The beneficial effects of this invention are as follows:

[0084] (1) Improve simulation accuracy: This invention optimizes the sediment transport ratio (SDR) calculation method and combines the water flow delay and sediment interception effect to more accurately simulate sediment transport in multi-pit pond areas.

[0085] (2) Simplified calculation process: This invention introduces the effects of water flow delay and sediment interception through simple formulas, avoiding complex hydrological model calculations and improving calculation efficiency.

[0086] (3) Wide adaptability: This invention is applicable to multi-pond systems and can dynamically adjust the sediment transport ratio (SDR) according to the actual conditions of the ponds in the watershed, thus having strong adaptability.

[0087] (4) Supporting watershed management: This invention provides a scientific basis for watershed sediment management and ecological restoration, and helps to formulate reasonable soil and water conservation and ecological restoration measures.

[0088] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the systems disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple; relevant parts can be referred to the method section.

[0089] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for optimizing the calculation of sediment transport ratio in multi-pit pond areas, characterized in that, include: Obtain raster data of at least one pit within the watershed; The raster data includes: pond type, pond area, water storage capacity, hydraulic retention time, and watershed hydrological characteristics; The sediment interception efficiency of each pit is determined based on the type and area of ​​the pit. The water flow delay factor of the pit is determined based on its area and water storage capacity. The water flow delay effect of the pit is considered, and the original confluence time is optimized according to the water flow delay factor to obtain the optimized confluence time. Based on the optimized confluence time and the sediment interception efficiency, the impact of each pit on sediment transport is iteratively calculated, and the sediment concentration is updated level by level. Taking into account the cumulative effects of the flow delay factor and the sediment interception effect, the initial sediment transport ratio during the stepwise sediment concentration update process is optimized to obtain the optimized sediment transport ratio.

2. The method for optimizing the sediment transport ratio in multi-pit pond areas according to claim 1, characterized in that, The types of ponds include: artificial aquaculture ponds, landscape ponds, and natural ponds.

3. The method for optimizing the sediment transport ratio in multi-pit pond areas according to claim 2, characterized in that, The formula for calculating the sediment interception efficiency is as follows: in, E j For the first j The sediment interception efficiency of the pits and ponds. k The preset area influence coefficient, A j For the first j The area of ​​the pit.

4. The method for optimizing the sediment transport ratio in multi-pit pond areas according to claim 1, characterized in that, The formula for calculating the water flow delay factor is as follows: in, A j For the first j The area of ​​the pit, V j For the first j The water storage capacity of each pit / pond D j Let be the water flow delay factor for the j-th pit.

5. The method for optimizing the sediment transport ratio in multi-pit pond areas according to claim 1, characterized in that, The formula for calculating the optimized merging time is as follows: in, T i The original convergence time, D j Let be the water flow delay factor for the j-th pond. To optimize the merging time.

6. The method for optimizing the sediment transport ratio in multi-pit pond areas according to claim 1, characterized in that, The formula for calculating the initial sediment transport ratio is: in, To optimize the initial sediment transport ratio of the i-th pixel, To optimize the merging time, E j For the first j The sediment interception efficiency of the pits and ponds. β This is an empirical coefficient. β The rate of decline used to describe the efficiency of sediment transport.

7. The method for optimizing the sediment transport ratio in multi-pit pond areas according to claim 1, characterized in that, The formula for calculating the optimized sediment transport ratio is as follows: in, To optimize the sediment transport ratio, β This is an empirical coefficient. β Used to describe the rate of decline in sediment transport efficiency. To optimize the merging time, A j For the first j The area of ​​the pit, V j For the first j The water storage capacity of each pit / pond E j For the first j The sediment interception efficiency of the pits and ponds.

8. A system for optimizing the sediment transport ratio in multi-pit pond areas, characterized in that, include: The data acquisition unit is used to acquire raster data of at least one pond within the watershed. The raster data includes: pond type, pond area, water storage capacity, hydraulic retention time, and watershed hydrological characteristics; An efficiency determination unit is used to determine the sediment interception efficiency of each pit based on the pit type and the pit area. The time optimization unit is used to determine the water flow delay factor of the pit based on the area and water storage capacity of the pit, and to optimize the original confluence time according to the water flow delay factor to obtain the optimized confluence time. The iterative calculation unit is used to iteratively calculate the impact of each pit on sediment transport based on the optimized confluence time and the sediment interception efficiency, and update the sediment concentration step by step. The result optimization unit is used to comprehensively consider the cumulative effects of the water flow delay factor and the sediment interception effect to optimize the initial sediment transport ratio in the process of progressively updating sediment concentration, and obtain the optimized sediment transport ratio.

Images