32 results about "Floodplain" patented technology

The invention provides a method for fast flood forecasting of river floodplains. The invention adopts the main technical scheme that the method comprises the following steps of: establishing three design curves for flooding of the floodplains: water level-flow rate, water level-area and water level-flow velocity, calculating the needed water level grade 'calculated flow rate of floodplains' according to the design curves, and carrying out flood forecasting by adding corresponding water level grade 'actually-measured flow rate of the main river channel' as 'full-section flow rate'. Since the actual measurement problem of the flooding flow rate of the floodplains is not related, the purpose of fast flood forecasting is achieved, the guarantee rate of flood forecasting is high, and the flood forecasting accuracy meets the requirement of the hydrologic measurement and forecasting specification by inspection.

The invention provides a grouting treatment method for a huge thick aquifer area on the roof of a coal seam, including the following stages: the first stage: before mining, carry out sedimentary facies analysis, select floodplain strata as the target layer, if there is no floodplain separated water layer , select the highly permeable aquifer as the target layer; the second stage: probe and locate the permeable skylight for the target layer of the floodplain, and make up for it by grouting, or grouting the highly permeable aquifer to transform it into an aquifer; third Stage: Before mining, monitor the stability of the aquifer that can be used after roof reconstruction; Stage 4: After mining, grouting the slip joints generated on the roof of the coal pillar to form a water-proof curtain. The invention makes up the skylight of the water-resisting layer by grouting before mining or transforms the high-permeability aquifer into a water-resisting layer, and grouting the slip joint after mining to form a water-resisting curtain, so as to reduce the thickness of the aquifer and reduce the mine water inflow. The purpose is to improve the underground operating environment, reduce costs, and restore normal production to the discontinued coal mines.

The invention discloses an evaluation method for flood detention and sedimentation function and disaster reduction effect of beach land, and particularly relates to an evaluation method for flood detention and sedimentation function and disaster reduction effect of a wide beach area in the lower reaches of the Yellow River. Compared with the existing method, the method of the present invention has a greater improvement in the evaluation of the flood detention and sedimentation function, and more accurately expresses the game relationship between the flood detention and sedimentation function and the disaster reduction effect in the wide beach area of ​​the lower reaches of the Yellow River, and quantitatively evaluates this This relationship allows decision makers to freely select the corresponding floodplain from different solutions when facing such a scenario, and guide the use of the wide floodplain in the lower reaches of the Yellow River. In the optimal solution set, decision makers can freely select the corresponding floodplain utilization and water and sediment regulation methods from different solutions. In different periods, different socioeconomic backgrounds, different water and sand scenarios, and different floodplain conditions, decision makers can make timely and appropriate scientific judgments based on the Pareto optimal solution set given by the present invention.

A method, apparatus, and article of manufacture provide the ability to define a floodplain encroachment. River reach and station information are received into a geographic information system (GIS). Floodplain encroachment values are defined using a graphical user interface (GUI). The GUI provides a simultaneous view of station identifiers for each station for which the floodplain encroachment is to be defined, profiles defined for each of the station identifiers, a method identification corresponding to each of the defined profiles, and a target water surface elevation change for each profile. The values are provided to a HEC-RAS engine which outputs analysis results that are simultaneously displayed in the GUI with the other information. The analysis results include a water surface elevation change, a top width, and a velocity for each profile-station pair. Users can modify the values and dynamically view the results from HEC-RAS in the GUI.

The invention discloses an overbank flow floodplain and channel excess flow computing method. According to the method, a computing formula of floodplain and main channel excess flow is built, and the floodplain and channel excess flow ratio in the computing formula is closely related to the water depth ratio, the width ratio and the roughness factor ratio. In order to determine a mutual relation, a compound section transverse distribution flow mathematical model is adopted for computing the floodplain and channel excess flow under different conditions, the relational expression between the floodplain and channel excess flow ratio and the water depth ratio, the relational expression between the floodplain and channel excess flow ratio and the width ratio, and the relational expression between the floodplain and channel excess flow ratio and the roughness factor ratio are obtained through analysis, and finally the overbank flow floodplain and channel excess flow is comprehensively obtained through the computing method. According to the computing method, when fluvial cross section conditions are certain, the floodplain and channel excess flow can be rapidly obtained according to the forecast cross section flow, and a basis is provided for planning and utilization of floodplain and water resources.

The present invention provides a method for grading and evaluating hydrological landforms of rivers in mountainous areas, comprising the steps of: first, monitoring or collecting relevant information of rivers in mountainous areas, and comprehensively utilizing remote sensing, GIS and GPS technologies to conduct preliminary analysis of river information, including the location of the river , landform characteristics and structure; second, according to the analytical results of step one, divide the monitoring units of mountainous rivers; third, monitor and record the hydrogeomorphic factors of each monitoring unit, wherein the hydrogeomorphic factors include riverbed, river bank , floodplain, and external stress factors, among which, the riverbed factor includes geometry, substrate, hydrology, vegetation, and river continuity under human influence; the river bank factor includes the reconstruction of the river bank, and the reconstruction of the river bank can be divided into natural and wide berms. The beam narrowness of the project and the beam narrowness of the narrow berm project; fourth, according to the monitoring results of step 3, carry out hydrogeomorphological classification for each monitoring unit.

The invention provides a method for optimizing ecological space and improving functions of river wetlands, and belongs to the technical field of river management. Determine and analyze the spatial structure of the current river, and obtain the area ratio of different river structures; determine the flow capacity of the river, and analyze the flood discharge capacity of the current river; And the flooding time and depth of the beach as the calculation basis, using the dichotomy method to analyze, respectively determine the excavation position of the river, the depth of the excavation, the vertical dredging space and the dredging volume, and optimize the wetland of the river beach; respectively analyze the spatial structure of the river before and after optimization Area, proportion and ecological space change amount, and evaluate the ecological space optimization scheme of the river course. Based on the comprehensive consideration of the structure and function of the river system, the present invention optimizes and manages the section of the river, realizes the improvement of the ecological function of the river and the optimization of the environment, and provides reference for the restoration, protection and function improvement of river wetlands in my country, as well as regional flood control and disaster reduction.

Disclosed is a Yellow River floodplain organic rice duck, fish and turtle livestock coupling production system method. Fishes (5) and turtles (7) are raised in a Yellow River floodplain low-lying area excavation pond (2), a rice field (1) is reclaimed to produce rice (33), produced rice straws (31) and cavings (32) are used as feeds of cows (6), the fishes (5) and ducks (4). The ducks (4) eat pests or / and weeds (12) bred in the rice field (1), soil nutrients (11) are added in duck feces (41), cow dung (62) is used for feeding the fishes (5), and produced pond silt (21) is applied to the rice field (1) to increase the soil nutrients (11). The method has the advantages that organic rice, duck, fish, turtle and livestock products can be produced simultaneously, manual material applying is not needed, waste is not released to the external environment, combination of planting and raising, reciprocal symbiosis and mutual generation and restriction are achieved, and recycling of substances, multi-stage utilization of energy and complementarity of economic benefits, social benefits and ecological benefits are achieved.

The invention discloses an automatic identification method for a floodplain and a main channel in a compound-section channel. The method comprises the following steps of: selecting a lowest-point elevation and a highest-point elevation of a compound section; taking the lowest-point elevation and the highest-point elevation as the lowest water level and the highest water level of section overflowing; from the highest water level, uprising for 0.05m every time until reaching the highest water level; calculating a section overflowing area and a wetted perimeter corresponding to each water level, determining a corresponding hydraulic radius, and establishing relation curves of the water levels and the hydraulic radiuses; based on characteristics of the curves, calculating the difference value of the hydraulic radiuses corresponding to two adjacent water levels according to the water levels from low to high, setting the critical values of hydraulic radius amplitudes, capturing sudden changes in the relation curves of the water levels and the hydraulic radiuses, and taking the sudden changes as demarcation points of the plain and the channel, and the plain and the plain. The method can quantificationally and automatically identify the main channel and the floodplain in the compound section, is simple and feasible, can be applied to quasi-two-dimensional flow and sediment mathematical modeling, and further can be used for evolution analysis on identifying the plain and the channel in the compound-section channel.

The invention discloses a river channel ecological restoration method based on the hydrological condition requirements of aquatic organisms. First, the river channel is investigated and surveyed, and then the position of the ecological restoration area is determined, the spur dike is arranged, the deep pool is formed by dredging, the floodplain is constructed, and the ecological restoration is determined. The planting area of ​​plants and other operations; the present invention appropriately transforms the shape of the river channel according to the needs of aquatic organisms for hydrology and habitat conditions, and at the same time arranges suitable aquatic organism species in different habitat areas to effectively restore the river ecosystem and improve the water quality of the river channel. Self-purification ability, restoration of biodiversity and improvement of ecosystem functions; at the same time, this restoration method increases the stability of river embankments without affecting the flood discharge capacity of the river, and improves the ecological function, landscape function and social function of the river. All have excellent effects.

A method for determining a candidate area for rice planting, the method comprising: extracting a floodplain area from a water body distribution map according to time-series water body index data; Calculate the slope conditions of the floodplain according to the elevation of the floodplain and carry out multiplicative weighted calculation on the inundation index of the pixel and the distance from the stable water body according to the slope conditions of the floodplain, to obtain the rice planting candidate area and candidate classification in the floodplain. The method provided by the invention extracts the flooded area in the water body distribution map according to the time-series water body index data, makes full use of the remote sensing big data, and can extract the inundation characteristics of the flooded area more accurately. , the convenience of irrigation, can more scientifically determine the rice planting candidate areas in the floodplain.

The invention relates to the field of ecological restoration of rainwater-type river water bodies, in particular to a compound riverbed environment system based on ecological flow velocity. Including a dry season ecological trough, a river course revetment covered with a river course base floodplain, and a river course revetment constructed in the form of the river course. For the foot protector for preventing erosion and fixing the bank, the floodplain surface is mixed with a floodplain water purification layer, and the dry season ecological trough is constructed by digging under the floodplain. According to the hydraulic characteristics of the aquatic organisms inhabiting the river, on the basis of defining the ecological flow rate suitable for the organisms, construct the river passage habitat in the dry season, and improve the hydrodynamic conditions of the rivers in the dry season of sewage interception and drainage, so as to ensure the habitat environment of the river aquatic organisms in the dry season. Meet the needs of aquatic organisms for survival and reproduction in dry seasons, induce the restoration of river ecological functions, and improve river biodiversity and stability.