Distributed hydrological model digitalization method for complex underlying surface city area

A distributed hydrology and urban area technology, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as lack of experience in digital refined input of drainage systems, improve model input accuracy, optimize simulation effects, enhance The effect of suitability

Active Publication Date: 2018-01-09
HEBEI UNIV OF ENG +1
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  • Description
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  • Application Information

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Problems solved by technology

For distributed hydrological models, there is currently a lack of a set of model data processing methods that are generally applicable to complex underlying urban areas, especially for urban built-up areas, the technical experience of watershed division and drainage system digital fine-grained input lacking
In addition, most of the existing distributed hydrological models are applied in the 50km 2 The range of large and medium-sized watersheds above, or limited to 10km 2 The following single construction land type areas (such as residential quarters, etc.), while within 10km 2 ~50km 2 Urban built-up areas of the scale are rarely used

Method used

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  • Distributed hydrological model digitalization method for complex underlying surface city area
  • Distributed hydrological model digitalization method for complex underlying surface city area
  • Distributed hydrological model digitalization method for complex underlying surface city area

Examples

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Embodiment 1

[0028] This embodiment is a case where the model digitization method is applied in the core area of ​​an economic development zone in Beijing, such as figure 1 As shown, the technical process includes: the collection and arrangement of basic data 1, the rationality analysis and review of the basic data is realized with the help of on-site survey 2, and the complex underlying surface of the urban area is divided into drainage areas after preliminary processing 3. The division of the drainage area according to the distribution of land types is the rough planning process of the sub-catchment area. 4. The land types of the sub-catchment area are relatively concentrated but still cannot meet the simulation accuracy. The method for improving the simulation accuracy of the model The sub-catchment unit refinement process 5 can be achieved by further finely dividing the sub-catchment area. The above-mentioned 3-5 processes belong to the refinement treatment process of the water catchmen...

Embodiment 2

[0035] Such as figure 2 As shown, this embodiment is an improvement of the first embodiment, and it is a refinement of the drainage system of the first embodiment. This embodiment also takes the typical urban area in Embodiment 1 as an example, and the drainage pipes (networks), rainwater wells, and rainwater collection points connect each sub-catchment area together. The drainage pipes in the core area involve 47 different specifications of 4 types of materials such as steel pipes, concrete pipes, reinforced concrete pipes, and ordinary cast iron pipes. The pipe materials will affect the setting of parameters such as the Manning coefficient of the model pipeline. The pipe specifications will be Affects model generalization pipeline shape parameters, etc. In addition, the rivers, ditches, and hardened roads in the core area are unified and generalized into drainage pipelines, and the corresponding attributes are stored in digital format in the GIS.

[0036] On the basis of th...

Embodiment 3

[0038] This embodiment is an improvement of the second embodiment, and is a further refinement of the drainage system in the second embodiment. The refined treatment of the drainage system described in this embodiment also involves topology checking and error handling.

[0039] Such as image 3 As shown, the distributed hydrological model has high requirements for input data. Taking the inspection and correction of the topological relationship of drainage pipes (networks) as an example, the set topology tolerance is 0.001m, and the topological inspection tool in ArcGIS is used first. Preliminary selection of pipe network data, automatic identification and correction of overlapping or unconnected pipe sections, correction of connection errors, overlapping points, lines, and surfaces, and screening of reasonable available pipe networks; then use the pre-running self-check function of the hydrological model , locate the problematic locations of the model topology inspection one ...

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Abstract

The invention discloses a distributed hydrological model digitalization method for a complex underlying surface city area. The method comprises the following steps of performing basic data collectingand sorting; performing site survey; performing drainage area division; performing sub water catchment area division; performing sub water catchment unit refinement; performing flow collection point generalization; performing drainage pipeline (network) generalization; performing drainage system refinement processing; and performing model digitalization input. The method has the advantages that through high-precision generalization and digitalization processing, the authenticity and reliability of data, needed to be input, of a distributed hydrological model are realized, and actual underlyingsurface conditions of the city area are restored and simulated as far as possible; the method can be applied to the model digitalization input of the multi-land use type cross distribution city built-up area; and by virtue of an ArcGIS technology and an RS technology, the generalization precision of digitalization of sub water catchment regions and drainage systems in a city range is improved, and the technical problems of hydrological process simulation and the like of the distributed hydrological model in the large-scale complex underlying surface city built-up area under the background ofstrong human activity influence are solved.

Description

technical field [0001] The invention relates to the technical field of oil and gas well safety, in particular to a method for digitizing distributed hydrological models of complex underlying surface urban areas. Background technique [0002] Distributed hydrological model is an important tool that can simulate complex hydrological phenomena and processes, and research and establish hydrological change laws. Its characteristic is that it can reflect the spatial heterogeneity of hydrological processes by means of discrete hydrological units. On the one hand, the complexity of urban built-up areas is reflected in the impact of strong human activities, which have changed the natural underlying surface conditions; on the other hand, the types of construction land (such as residential land, land for public services and commercial service facilities, etc.) Diversity. There are differences in the spatial layout and area ratio of the permeable and impermeable areas in different land ...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 栾清华付潇然王海潮刘家宏王英吕烨张坤王东马骏
Owner HEBEI UNIV OF ENG
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