Fast coding method for a large quantity of sub-basins on basis of digital river network

Abstract

The invention discloses a fast coding method for a large quantity of sub-basins on the basis of a digital river network. The method changes the mode that river network coding is conducted by means ofraster data in tradition, takes the digital river network as a basis and comprises the steps that 1, DEM data of a studying basin is acquired and processed to obtain data of the flow direction, the flow accumulation and the river network vector; 2, the flow accumulation of various vector river channels is counted; 3, river network level recognition, naming and coding rules are made; 4, a program is written to code the vector river network to obtain river network coding information; and 5, various sub-basins are determined through partitioning according to river network coding results. According to the fast coding method for a large quantity of sub-basins on the basis of the digital river network, the river network coding efficiency and the data capacity are greatly improved, the newly-established river network naming rule has the advantages of being capable of reflecting the river levels, stable in topological relation, unlimited in river number, capable of supporting flow confluence of multiple river reaches, easy to update and the like, querying, storage and analysis are convenient, and the new method is provided for coding the basin river network and sub-basin levels.

Description

technical field [0001] The invention relates to a fast coding method for a large number of sub-watersheds based on a digital river network. Background technique [0002] In recent years, digital watershed models based on sub-watershed divisions have been widely used in hydrological simulation, watershed management, and environmental protection, such as SWAT models and WEP-L models. This type of model mainly divides and codes the rivers and their sub-basins in the research basin according to the digital elevation model (DEM), and then performs parameter calculation and hydrological simulation for each sub-basin, thereby realizing distributed simulation calculations of large watersheds. Therefore, coding rivers and sub-basins is the premise and basis for distributed hydrological simulation. [0003] At present, the identification method of river grade is mainly based on raster data, which has limited input data and slow calculation speed, which cannot meet the needs of calcul...

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Problems solved by technology

However, these methods have varying degrees of deficiencies in expressing the topological relationship of the river networ

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