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DEM-based inland lake catchment area demarcation method

A water catchment and basic technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as difficult water catchment delineation, internal flow lakes and lakes lack of clear watershed outlets, etc.

Active Publication Date: 2017-06-27
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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Problems solved by technology

[0004] In view of the above-mentioned deficiencies in the prior art, the DEM-based water catchment delineation method of inland lakes provided by the present invention solves the problem that inland lakes lack clear watershed outlets, which makes it difficult to carry out water catchment divisions directly on the geographic information platform fixed question

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  • DEM-based inland lake catchment area demarcation method
  • DEM-based inland lake catchment area demarcation method

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Embodiment Construction

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiment is only one embodiment of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0035] Such as figure 1 As shown, the DEM-based method for watershed delineation of inland lakes includes:

[0036] S1: Obtain the DEM data of the elevation digital model in the set area, and cut it to obtain the basic DEM data; in the specific implementation, use the Arcgis platform to cut the DEM data of the elevation digital model to make the lake inlet Located on the boundary of the raster file, and the raster file covers the watershed of the river where it is ...

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Abstract

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.

Description

technical field [0001] The invention relates to a method for dividing water catchment areas of rivers and lakes, in particular to a DEM-based method for dividing water catchment areas of inflow lakes. Background technique [0002] At present, the widely used method for simulating the hydrological process of a watershed is the distributed hydrological model, whose most notable feature is the effective combination with DEM; in order to be able to consider the spatial specificity of hydrological parameters and processes, the distributed hydrological model needs to disperse the watershed into relatively Small and relatively single spatial units, water moves and exchanges between discrete units, and the division of spatial units is an important basis for distributed hydrological models. [0003] In a watershed with vertical and horizontal river networks and dense lakes, lakes, reservoirs, and polders are all units with independent water accumulation functions, and should be divid...

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Application Information

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IPC IPC(8): G06F17/50G06F17/30
CPCG06F16/29G06F30/00
Inventor 刘芳景兰舒蒋云钟史婉丽秦天玲翁白莎严登华
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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