165 results about "Catchment area" patented technology

The invention relates to the technical field of flood drainage of cities, in particular a flood drainage planning and designing method for non-plain cities, which comprises the following steps of: determining a city flood drainage planning recurrence interval according to the importance of a city and a city flood drainage catchment area; calculating a peak discharge of an inland river catchment; dividing the catchment area of the inland river into an upstream suburban area and a downstream urban area, respectively calculating an upstream peak discharge and a downstream urban area peak discharge, and adding the upstream peak discharge and the downstream urban area peak discharge to obtain an overall inland river catchment peak discharge; determining a city flood drainage scheme; determining a water surface profile of the inland river; and combining the flood draining planning with a city vertical planning and a draining planning, and when the water level of the inland river reaches the highest point, controlling a control elevation of the lowest point of the non-plain city to be not smaller than the water level elevation of the backwater of a rainwater draining system at the lowest point. The method has the advantages of contribution to discharging flood of the inland river of the non-plain city, and preventing the occurrence of inland inundation in the urban area.

The invention discloses an urban rainstorm water accumulation assessment modeling method based on full space-time, and the method comprises the following steps: 1, obtaining DSM data containing surface information, employing a D8 algorithm to divide a water catchment area, and modifying the boundary of the water catchment area according to the connection and distribution conditions of a real pipenetwork, so as to obtain the divided water catchment area; 2, establishing a surface runoff production model, and calculating runoff production of each catchment area; Step 3, establishing a surface confluence model, and calculating confluence of each catchment area; And step 4, establishing a drainage experience model to carry out drainage calculation, and calculating the drainage capacity of each catchment area through the drainage experience model so as to obtain an urban inland inundation assessment result. The DSM is adopted to divide the urban catchment area, the influence of urban planning and construction on urban topography reconstruction can be well reflected, and the method is more practical; The problem that drainage calculation cannot be carried out due to lack of structural data of a drainage pipeline is solved, and the operation time of the model is remarkably shortened.

The invention discloses a method for calculating the performance evaluation index of sponge city based on the measured value of the plot. Firstly, the site vertical arrangement, the sponge facility arrangement and the rainwater control flow field inspection are carried out, and the concentration of the total suspended solids of the initial and later rainwater runoff and the actual soil permeability parameters are obtained through the on-site monitoring and the actual data collection. Rezoning catchment zones; the topological structure model between catchment area, sponge facility and drainagenode is established, and the effective catchment area, ineffective catchment area, permeability ratio, initial runoff total suspended solids concentration, later runoff total suspended solids concentration and soil permeability parameters are substituted into the rainfall-flood model software. The operation model obtains the annual runoff control quantity and the facility annual total suspended matter removal rate, and then calculates the annual runoff total amount control rate and the annual total suspended matter removal rate. The invention can ensure the accurate evaluation of the performance evaluation index of the land sponge city, and is beneficial to the improvement of the land sponge city.

The invention discloses a method for evaluating service value of an ecological system for abating non-point source pollution in a water environment. The method includes simulating the ranges of catchment areas by the aid of a model for evaluating the service quality of the ecological system for abating the non-point source pollution in the water environment on the basis of ArcGIS9.2 hydrological analysis tool sets and water and pollutant solute and sediment conjugation migration theories, and defining service providers and service objects; combining output coefficients of certain pollutants of various land utilization types with one another according to hydrological sensitivity coefficients, and identifying critical pollution source areas; combining certain pollutant filter capacity coefficients of the different land utilization types on each grid pixel with one another along flow concentration paths to obtain the pollutant removing quality of vegetation. The value quantity model is computed by the aid of a combination of the marginal cost spent on purifying the certain pollutants and expected water quality standards of outlet sections of the catchment areas.

The invention discloses a biological fluidized bed adopting a tubular membrane and a water treatment method for the biological fluidized bed. According to the biological fluidized bed and the water treatment method for the same, the concentration of suspended microbes can be reduced, membrane pollution can be suppressed, the service life of the membrane can be prolonged, the concentration of suspended matters in effluent can be reduced, carrier loss can be avoided, and the effluent quality can be improved. A tubular membrane component is arranged on the middle part of a barrel. A catchment area is formed between a tube shell and the tubular membrane. A water outlet communicated with the catchment area is formed at the lower end of the tube shell, and is connected with a discharge pump through a catchment pipeline. An air outlet communicated with the catchment area is formed at the upper end of the tube shell. A raw water area is formed between the upper end of the tubular membrane component and the barrel. A gas-liquid mixing area is formed between the lower end of the tubular membrane component and the barrel. An aeration head opposite to an inner cavity of the tubular membrane is arranged at the bottom of the barrel. The inner cavity of the tubular membrane is an upflow area. A downflow area is formed between the tube shell and the barrel. Active sludge cultivated by the microbes and carrier particles with formed biofilms are arranged in the barrel. The fluidized bed has a good water treatment effect.

The invention discloses an urban area water logging flood processing simulation method based on a CD-TIN. The urban area water logging flood processing simulation method based on the CD-TIN takes a catchment area of an urban area based on a triangle surface patch partition as the basis of subsequent simulations. The urban area water logging flood processing simulation method based on the CD-TIN comprises (1) offering a calculation method of water volume runoff yield process in the catchment area based on inflow water volume and outflow water volume, (2) proposing a calculation method of dropsy water level in a flood area based on a triangular prism formed by a triangle which is taken as a bottom and three plumb lines which are made upwards from the three peak points of the triangle, and (3) designing a water volume confluence flow calculation method which takes characteristics of earth surface into consideration after the water volume of the catchment area reaches an water outlet. The urban area water logging flood processing simulation method based on the CD-TIN can effectively stimulate and analyze the range and the water depth of the urban area water logging flood, offers a new method for the research of an analysis software of the urban area water logging flood, and can supply technical support for urban area flood prevention, drainage scheme and emergency warning and rescue.

The invention discloses a DEM-based inland lake catchment area demarcation method. The method comprises the steps that DEM data of a digital elevation model in a set region is acquired, and the DEM data is cut to obtain basic DEM data; a ridge line in the set region is established according to the basic DEM data; spatial units of the digital elevation model are divided to obtain spatial flow direction raster data; and an inland lake catchment area is established according to the ridge line and the spatial flow direction raster data. Through the DEM-based inland lake catchment area demarcation method, the problem that it is difficult to perform catchment area demarcation directly on a geographic information platform because an inland lake lacks an explicit drainage basin outlet is effectively solved.

The invention provides an inclined tube floating device for waste water treatment, belonging to the technical field of environmental protection, which is characterized in that: a water inlet is communicated with a whirl mixer arranged at the front end of the device; a mud bucket is arranged on the bottom end of the device body; the device is internally provided with a perforated dredge pipe above which is mounted with a depression area; the depression area is internally provided with an inclined plate and communicated with an absorption area which is arranged at the back end of a buffer area, the absorption area is internally provided with a releasing device of air flotation microbubbles, namely, an activated ploy-oxygen aerator; a mud collecting tank is also mounted on the top end of the absorption area; a catchment area is mounted on the top end of the buffer area, and water collecting equipment is mounted in the catchment area; the upper part of a reaction area is provided with an electric scraping vehicle for removing scum generated by air flotation, and the tail part thereof is provided with an effluent tank which is internally provided with a liquid level regulator; the bottom of the liquid level regulator is provided with a drain pipe. The invention has the beneficial effects of improving treatment effect, evenly mixing medicament and waste water, saving occupied area and materials consumption, increasing air flotation effect, lowering dramatically moisture content of the scum, eliminating dead zones in sludge discharging of devices, optimizing the effluent water quality and reducing moisture content of the sludge.

The invention relates to the technical field of rainwater drainage, in particular to a method of importing CAD data based on GIS into SWMM. The method includes the following steps: step 1, pre-processing CAD data, deleting and classifying the data before importing so as to be used by GIS; step 2, conducting data verification to verify whet that topological relationship between the node and the pipeline is correct; step 3, conducting GIS data extraction and calculation: including node data extraction, pipeline data extraction, catchment data extraction; step 4, importing that data into the SWMMmodel; step 5, carrying out result and parameter analysis: testing and simulating the imported model. The method has the beneficial effects of saving the SWMM modeling time of the CAD and GIS data sources, improving the model data precision, reducing the human error, realizing the lossless conversion and realizing the parameter determination of the node bottom hole elevation, the characteristic width of the catchment area, the average slope, the water storage quantity of the depression, the impermeability percentage and the like.

The invention relates to a road pavement runoff sewage intercepting wetland zone and a construction method thereof. An emergent aquatic plant pond, a horizontal subsurface flow constructed wetland, a submerged plant pond and other constructed road pavement source pollution control wetland zones are sequentially arranged nearby a road surface runoff catchment area, surface runoff pollutions are effectively controlled and then discharged into water bodies of rivers and lakes through effects of regulation and storage as well as sedimentation, purification and biodegradation, and pollution load entering the surface water body such as rivers and lakes is reduced. Compared with the prior art, the wetland zone and the construction method have the advantages that more than 30% of the surface runoff pollutions can be removed, so that a guarantee is provided for the water qualities of the water bodies of rivers and lakes and the integrity of ecological systems for the water bodies of rivers and lakes.

The invention relates to an urban catchment area division method. The urban catchment area division method comprises the steps: obtaining a refined digital elevation model, correcting the digital elevation model, carrying out catchment area division on digital elevation models with different resolutions, and determining the optimal resolution. The urban catchment area division method has the advantages that the digital elevation model is refined, and the influence of all urban terrains on catchment area division is fully considered; the digital elevation model is corrected based on urban drainage points, and the influence of the drainage points on catchment area division is converted into elevation values, and the accuracy of catchment area division is improved; by determining the optimalresolution, the influence of DEM data with different resolutions on catchment area division is fully considered, and the rationality of catchment area division is improved.

The invention particularly relates to a method for setting up drainage blind ditches in a large-scale landfill site in a loess hilly and gully region. A primary blind ditch is set up in a valley withbig catchment area and large flow volume, a secondary blind ditch is set up in a small gully, and drainage branch blind ditches are set up at spring eyes, structure water outlet points or other percolation points. The stratum positions of the blind ditches are set at the interface between a soil layer and a bedrock; the terrain positions of the blind ditches are selected based on that the primaryblind ditch should be set up along the bottom of the valley and the secondary blind ditch and the branch blind ditches should be prevented from excessive changes in slope as much as possible. The slope of the blind ditches is set to not less than 0.5%, and for a steep part with a big slope, vertically connected blind ditches are adopted. A geotextile covers the full cross-sections at the inlets ofthe blind ditches, and at the same time, stones are filled within 2m of the inlets of the blind ditches. The outlets of the blind ditches are subjected to special reinforcement according to the terrain. The method can guide the design and construction of the blind ditches in more detail and is more suitable for the large-scale landfill site in the loess hilly and gully region.

The invention discloses a catchment area dividing method based on a triangle patch, which comprises: 1) a confluence path extracting method based on a plane-point-side-point confluence mode that water of the triangle patch converges at the lowest point and then converges at the maximum side along slope; 2) a dividing method for marking a first-level catchment area of an upstream triangle based on the plane-point-side-point confluence mode; and 3) a multi-level catchment area dividing method for filling low-lying vertex in the catchment area based on the elevation of a catchment area water outlet. The catchment area dividing method based on the triangle patch can be applied to basin characteristic analysis of confluence path extraction, catchment area (multi-level) division and water outlet judgment of digital earth surface (comprising complex earth surface based on CD-triangulated irregular network (CD-TIN)) represented by the TIN, provides a new method for TIN-based digital elevation model (DEM) basin characteristic analysis, and can develop the corresponding software for the digital hydrological field (applied to urban waterlogging flood process simulation and simulated analysis).

The invention provides a rainwater collection and treatment system for a sponge city. The system comprises a site rainwater pipe network, the site rainwater pipe network comprises a plurality of sub-catchment areas obtained by dividing a site according to areas in advance, according to each of the sub-catchment areas, by using a drain pipeline, a part of rainwater splits, and is collected and concentrated to a rainwater main pipeline, the other part splits to a municipal drainage pipeline, the rainwater main pipeline delivers the rainwater to a rainwater collecting pool through a rainwater intercepting and basket hanging device, a rainwater abandonment filtering device and a rainwater filtering device buried under the ground surface, the rainwater collecting pool is provided with an inspection well and a reusing well, recovered water in the rainwater collecting pool is lifted to the ground through a lifting pump in the reusing well, is further purified by a purifying integrated machine, and then is used for road washing or green irrigation. The system is managed according to regions, abides by the principle of ecological priority, promotes the utilization of rainwater resources andecological environment protection, reduces the discharging amount of regional rainwater runoff, and achieves ecological effects.

The invention discloses a sponge city test point area low-influence development facility simulation method, which comprises the steps of establishing an overall background model of a test point area in a storm flood management model SWMM, and simulating a rainwater runoff total amount and a runoff peak value before sponge city construction; selecting a target source project in the test point area,utilizing a low-influence development facility simulation module in the SWMM model to input design parameters corresponding to different types of low-influence development facility LIDs in the targetsource project, establishing a project model of the target source project, and simulating a reduction result of the target source project on the total rainwater runoff amount and the peak value, wherein the target source project is generalized into a sub-catchment area in the area integral model; and according to the simulation result of the target source project in the project model, the basic parameters of the sub-catchment area corresponding to the target source project are calculated and adjusted through the parameters, so that the overall sponge city construction effect of the test pointarea is embodied in the area model. According to the method, in large-scale regional simulation, the accuracy of low-influence development facility effect simulation in a regional model is guaranteed.