67 results about "Runoff coefficient" patented technology

The invention discloses a rainwater low-impact development planning method based on waterlogging risk assessment, which includes the following steps: S1: quickly assessing the waterlogging risk in the planning area; S2: according to the regional hydrological characteristics of the planning area, the nature of the underlying surface, and the available space , urban planning scheme, development intensity specification, and waterlogging risk determine the priority utility function equation of the planning area, determine the priority of low-impact development and deployment in the planning area, and then sort and judge the suitability of low-impact deployment; S3: According to the The low-impact development priority class divides the planning area into several unit blocks, and assigns the overall target of runoff coefficient control in the planning area to each of the unit blocks until the total runoff coefficient determined by the weighted calculation of each unit block satisfies the runoff coefficient control of the planning area. The overall goal; S4: Draw the spatial layout map of runoff coefficient control in the planning area to provide decision support for low-impact development planning.

An USRAMS-based optimization design method of a rainwater pipe network belongs to the crossing field of drainage pipe line design and hydraulic models. Aiming at the imperfection of the rational formula method and the requirements of the new version Outdoor Drainage Specifications, the invention is based on rainwater pipe network design data to establish a USRAMS rainwater pipe network hydraulic model; kinematic wave is adopted for simulating calculation; pipe section overload is used as the verification standard according to the model results; the design scheme is optimized according to the model results so that the reliability of rainwater pipe network design is increased. The number of required parameters is less and the parameters are easy to obtain; the runoff coefficient and the water catchment time can be directly obtained; the process of establishing models is simple and quick; the model results are reliable; the applicability of the method is guaranteed; the method has operability; complicated programming is not required; steps can be finished by means of present software; the operation is simple and easy; the feasibility of the invention is guaranteed.

The invention discloses a rainwater low impact development (LID) planning method and a rainwater LID planning device. The rainwater LID planning method comprises the steps of: acquiring annual rainwater runoff coefficients of plots in a planning area and a runoff peak value of the planning area; planning rainwater facilities as an impact factor of each plot into the plot; calculating annual rainwater runoff coefficients of the plots added with the rainwater facilities and a runoff peak value of the planning area; judging whether the annual rainwater runoff coefficients are within a first preset range, and judging whether the runoff peak value is within a second preset range, if so, optimizing layout of the rainwater facilities in the planning area by adopting a rainwater facility optimization algorithm, otherwise, adjusting layout of the rainwater facilities in the planning area by adopting a rainwater facility adjustment algorithm. The rainwater LID planning method and the rainwater LID planning device achieve the modeling of a planning scheme after adding the rainwater facilities, can be used for planning the rainwater facilities in the planning area, and can optimize and adjust the layout of the rainwater facilities in the planning area according to the runoff coefficients of the plots and the runoff peak value of the planning area.

The invention discloses a reservoir scheduling early warning method based on meteorological numerical forecasting, which comprises the following steps: calculating the interceptable water storage capacity in a basin according to the acquired hydrological information of each hydropower station in the basin of a target reservoir, and correcting the early-stage influence rainfall Pa according to theinterceptable water storage capacity; determining a runoff coefficient rho according to the hydrological information and the meteorological information, calculating the capacity storage purified wateramount and the capacity storage precipitation amount of the reservoir based on the runoff coefficient rho, and carrying out capacity storage precipitation amount early warning; according to the hydrological information, the drainage basin information, the early-stage influence rainfall Pa, the runoff coefficient rho and the meteorological information, short-term period runoff prediction of the reservoir is conducted, and the medium-term and long-term end water level is calculated; and determining a flood prevention early warning level and a drought resistance early warning level according tothe hydrological information, the meteorological information and the end-of-period water level information, and performing reservoir scheduling. The reservoir scheduling early warning method has the advantages that the reservoir scheduling risk early warning capacity is improved, and life and property safety of reservoir dams and downstream people is ensured.

The invention discloses a water surface rate value domain measuring and calculating method suitable for urban water ecological protection. The method comprises the following steps of measuring the DEMelevation data; defining a rainwater control subarea; acquiring the typical year day-by-day meteorological data, and establishing a rainfall model and an evaporation model; screening out the rainfallcourses which do not form runoff, and carrying out first rain reduction at the same time; determining a comprehensive runoff coefficient; calculating a permeability coefficient and infiltration amount; making an urban water system water circulation target; and constructing a water depth change model, and calculating the suitable urban water surface rate. According to the method, the urban water surface rate can be quickly and accurately calculated, the spatial attribute of the urban water surface rate value domain indexes is enhanced, and the reasonability of the urban water area layout is improved.

The invention provides a runoff calculation method of an uncontrolled area based on a spatial distributed runoff coefficient, which is characterized in that the method comprises the following steps: 1. preparing data of the uncontrolled area, including topographic data, land use type data, rainfall data and measured runoff data of an upstream control area; And the corresponding raster data in thestudy area are obtained by embedding, cutting, projection conversion and spatial interpolation of terrain data, land use type data and rainfall data, in which the spatial resolution of the raster dataof terrain data, land use type data and rainfall data is the same; 2, constructing a runoff coefficient model based on spatial distribution, calculating runoff based on pixel level, determining runoff coefficients corresponding to each pixel in the uncontrolled area, calculating grid runoff of corresponding pixels according to the runoff coefficients of each pixel, and then accumulating the gridrunoff of all pixels in the uncontrolled area to obtain regional runoff; 3. validating the runoff coefficient model.

The invention discloses a monitoring and early warning system for hidden discharge of industrial waste water. The system comprises a flowmeter, a raindrop sensor, a rainfall analysis module, an automatic water sample collector and an alarm device; the system is arranged at a water outlet of a rainwater pipe net of an enterprise; the rainfall analysis module can analyze and calculate the total amount of rainwater runoff of a plant area in the raining process according to the total water catchment area, the runoff coefficient and average rainfall intensity of the plant area, the average rainfallduration, the rainwear collection amount at the primary stage and other parameters in a plant area range, can also analyze and compare the total amount of the rainwater runoff of the plant area withthe water flow of the flowmeter, and accordingly can judge whether or not the enterprise has hidden discharge behaviors. When hidden discharge behavior of the enterprise is monitored, the alarm deviceis automatically started, the automatic water sample collector is started to reserve and store samples of waste water which is hiddenly discharged, and following monitoring and analysis are facilitated. The water amount of the rainwater pipe net of the plant area of the enterprise is monitored, the hidden discharge behaviors of the enterprise are effectively prevented, the system has the advantages of being low in manufacturing cost, stable in performance, high in automation degree and the like, and the supervision force of the environmental supervision department to the stealing discharge behaviors of the enterprise can be effectively increased.

The invention provides a method for producing the biological assembly material for the rain collecting and maintaining and provides a half-finished product of biological crust which can be lied instantly and is facilitating for transportation and easy for mass production, which creats favourable conditions for the large-area spread and use. The said material concludes: the culture medium employing a kind of fibrous material, the surface soil lied on the culture medium with the coverage of lichens or moss which is used as the rain-collecting biological material. The invention is used for the repairing and constructing of the rain-collecting slope in the arid or half-arid area, which can increase the slope runoff coefficient and collecting efficient, and possesses the characteristics of durability, environmental protection, soil and water conservation, improvement of the soil physicochemical deseription and promoting the soil development, etc. The rain-collecting material possesses a great potential for usage.

The invention discloses a method for determining the optimal plant density of a three-dimensional geonet pad ecological slope protection slope surface, and relates to stability of the side slope or the slope. The method comprises: calculating the runoff depth, the minimum slope soil particle starting speed and the slope average runoff speed according to the runoff coefficient, the slope typical soil particle diameter, the slope roughness, the slope angle, the plant tillering coefficient, the leaf shape, the actual dry volume weight of soil, the stable dry volume weight after compaction, the film water parameter and the comprehensive binding power parameter; obtaining the total transverse row number of plants on the ecological grass planting slope surface according to the relationship between the average runoff speed of the slope surface and the minimum starting speed of slope soil particles; finally, determining the optimal plant density of the slope surface of the three-dimensional geonet pad ecological slope protection according to the total transverse row number of the plants. The defect that in the prior art, the optimal plant density of the slope surface cannot be accurately calculated in the construction process of the three-dimensional geonet pad ecological slope protection is overcome, a large number of surplus purchased grass seeds are prevented, and the engineering cost is greatly reduced.

The invention relates to a portable test trough applied to field rainfall test and a test method. The portable test trough applied to field rainfall test comprises a plurality of baffles and an end cap, wherein connecting plugs and fixing hole structures are separately arranged at the edges of the baffles and the end cap, stainless steel rods are inserted in fixing holes, thus, the baffles keep stable relatively, the baffles and the end cap also keep stable relatively, and a water outlet is formed in the bottom end of a trough body. The portable test trough applied to field rainfall test has the beneficial effects that test spaces in different sizes are formed in a surrounding manner by increasing and reducing the number of the baffles, therefore, various test regions in different sizes orshapes are formed, the shortcoming of form simplification of a traditional device is overcome, the problem of poor structural stability is further solved, the portable test trough has the advantagesof easiness in mounting, convenience in carrying and the like, and the portable test trough is combined to a rainfall simulator, not only can be used for analyzing influences of factors such as vegetation coverage, rainfall factors and terrain to soil erosion, but also can be used for measuring parameters such as different types of soil runoff coefficients, slope runoff volume, erosion and sediment yield and runoff producing critical rainfall threshold values.

The embodiment of the invention provides an urban waterlogging detection method and device. The method comprises the following steps: acquiring a cloud layer position and rainfall of an overhead cloud layer of a target city; predicting wind condition information of the target city in a future target time period according to the current wind condition of the target city, wherein the wind condition information comprises the wind condition of each region of the target city; calculating a rainfall position according to the cloud layer position and the wind condition information; the runoff coefficient of each building area covered by the rainfall position is obtained, and the runoff coefficient is used for representing the drainage capacity of the corresponding building area; calculating the rainfall capacity of each building area covered by rainfall based on the rainfall capacity and the rainfall position; and determining whether waterlogging will occur in the building area according to the runoff coefficient of each building area and the rainfall of the corresponding building area. By predicting the rainfall capacity and the rainfall position of the cloud layer above the target city in advance, the rainfall capacity of each region in the target city can be accurately predicted, and the waterlogging detection accuracy of each region of the city is improved.

The invention discloses an urban rainwater runoff regulation and control method based on LID measures. The method comprises the steps that 1, a Lagrange interpolation method is used for obtaining a runoff coefficient before development; an LID control editing module in a rainstorm management model is utilized for obtaining the parameter value range of the LID measures; parameters of a surface layer, a pavement layer, a soil layer, a water storage layer and a closed conduit are adjusted according to design requirements; 2, sub-catchment areas are divided, a first-level catchment area with a main river as the center is formed, a second-level catchment area is divided according to a refined DEM graph, and a third-level catchment area is formed according to the distribution condition of drainage facility space; 3, hydrological process simulation is executed; and 4, hydraulic process simulation is executed.

The embodiment of the invention provides an urban runoff data processing method. The method comprises the following steps: determining a data set; wherein the data set at least comprises the followingparameters: basic attribute data of land utilization, basic attribute data of water quality, basic attribute data of weather, runoff coefficient parameters and basic attribute data of pollutant discharge; acquiring parameters and data in the determined data set; calculating and accounting the urban runoff pollutant discharge amount, and compiling an urban runoff discharge data set. According to the scheme, the urban runoff data processing method is provided, and water resource data can be subjected to refined analysis and processing.

The invention discloses a waterlogging storage water surface rate partition processing method based on urban waterlogging basic information. The method comprises the steps that basic information suchas rainfall runoff coefficients, main duration rainfall statistical results and current water surface rates, input by a user, of a current region is acquired; obtaining a designed flood drainage flowaccording to the basic information and the rainfall flood process control information; obtaining a designed regulation and storage water depth according to the designed drainage flow and the basic information; obtaining a corresponding designed rainstorm duration according to the designed flood drainage flow or the designed regulation and storage water depth; designing rainstorm duration accordingto the designed flood drainage flow to obtain partition indexes; zoning threshold delimiting is conducted on the waterlogging storage water surface rate of the current region through zoning indexes,and a region division result is obtained; and outputing results of zone partition. According to the processing method, the calculation process can be simplified, the workload of multi-scenario adjustment is reduced, and the operability is high; and the design scheme of the urban flood drainage system can be optimized according to local conditions in combination with the partitioning result of theurban water surface rate.

The invention provides a pipe network-river coupling model checking characteristic parameter calibration method. The method comprises the following steps of S1, regional selection on a large-watershedrainstorm intensity formula and a rainstorm recurrence period; S2, zoning selection of surface soil characteristics and runoff coefficients; S3, overflow coupling of a pavement side ditch and a pipeline; S4, a pipeline friction resistance and gradient and inspection well and regulation and storage facility feature processing technology; and S5, tidal riverway and pipe network system characteristics. The hydrological model parameter calibration method has the beneficial effects that rainfall characteristics, surface soil characteristics and runoff coefficients, road surface side ditch and pipeline overflow, pipeline friction resistance, gradient, inspection wells, regulation and storage facility characteristics and tidal riverway and pipe network system characteristics under the large watershed zoning condition are comprehensively considered, and the parameter calibration precision of the hydrological model is improved.

The invention discloses a sidewalk system, which comprises a main stem and a sidewalk along the main stem; one side of the main stem closing to the sidewalk is provided with gutter inlets at intervals along the length direction of the main stem. The sidewalk system is characterized in that the water-collecting well for collecting rainwater of the sidewalk are buried on the sidewalk, the water-collecting well are corresponding to the gutter inlets one by one; the upper ends of the water-collecting wells are provided with overflow pipes connected into the gutter inlets. The sidewalk system has the advantages of possessing the rainwater collecting function, reducing rainwater runoff coefficient, relieving the pressure of an urban draining system, improving the rainwater repeating utilization factor, saving water resource, and the like.