A runoff modulus grid-based watershed hydrologic regime expression method

Abstract

The application discloses a runoff modulus grid-based expression method of a watershed hydrological regime, acquires digital elevation model data of a target watershed, fills in a pit and resamples, inputs the resampled elevation data into a watershed digitization and geomorphologic feature extraction system, automatically acquires the steepest slope of a grid, a grid flow direction, a grid cumulative catchment area, a river grid and a watershed boundary, acquires historical measured data of a watershed site to construct a flood scene set, adopts a grid Xin'anjiang model to perform parameter calibration, combines real-time rainfall, calculates a watershed grid flow time sequence, further calculates a runoff modulus time sequence, statistically processes time sequence characteristics of the watershed grid runoff modulus and performs normalization processing, generates runoff mode color step grids in a quantitative and dynamic color step mode respectively, and further draws a thermal map time sequence set. The application realizes intuitive and dynamic display of flow calculation results in the whole watershed range through the watershed runoff modulus grid, clearly and reasonably expresses the watershed hydrological regime, and enriches water regime expression means.

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