A simulation method of reconfiguration and confluence based on the characteristics of the underlying surface

Abstract

The invention discloses a reconfiguration confluence simulation method based on underlying surface features, and belongs to the technical field of hydrology. The reconfiguration confluence simulationmethod comprises the following steps: 1, packaging confluence calculation modes and numbering the confluence calculation modes respectively; 2, calculating to obtain a gradient grid Raster_Slope, a flow direction grid Raster_Dir and a confluence accumulation grid Raster_Acc on the basis of the basin DEM data; 3, extracting and obtaining river channel grids and slope surface grids in the drainage basin, and grading the river channel grids; and 4, dividing grids in the graded drainage basin based on the gradient grids and the riverway into four areas of KP, YP, MH and FH, and respectively matching different confluence modes in different areas to perform confluence calculation. The reconfiguration confluence simulation method guarantees the precision and reliability of a calculation result, solves a problem of confluence calculation in mountainous small and medium-sized watersheds with obvious underlying surface feature spatial variation, facilitates the direct call of a confluence calculation method based on underlying surface features, and promotes the deep development of digital hydrology and mountainous small and medium-sized watershed mountain torrent prevention and control research.

Description

technical field [0001] The invention belongs to the technical field of hydrology, and in particular relates to a reconfiguration and confluence simulation method based on the characteristics of an underlying surface. Background technique [0002] In recent years, affected by climate change, sudden floods of small and medium-sized rivers caused by local heavy rainfall have occurred frequently, and have become the main disasters causing casualties. There are many rivers in my country, with a drainage area of ​​200 to 3000 km 2 There are nearly 9,000 small and medium watersheds in China. Because small and medium-sized watersheds are usually located in remote mountainous areas with complex terrain and steep slopes, rapidly rising floods can easily cause flood disasters that endanger the personal safety of local residents and the social economy. Therefore, accurate and reliable early warning and forecasting of sudden floods in small and medium-sized watersheds has become an urge...

AI Technical Summary

Problems solved by technology

[0005] Therefore, the use of a single confluence calculation method often fails to take into account the influence of the spatial variability of the underlying surface characteristics of the watershed on the confluence process, which brings certain deviations to the confluence calculation of the hydrological model, which in turn affects the final early warning and forecasting effect. Bring certain hidden dangers to mountain torrent disaster prevention and control

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