Watershed wetland flood regulation and storage function quantitative evaluation method

Abstract

The invention provides a watershed wetland flood regulation and storage function quantitative evaluation method. The method comprises the steps of 1, constructing a watershed hydrological model coupled with a wetland module; 2, performing basin hydrological process simulation under different wetland distribution situations according to the basin hydrological model, and obtaining corresponding riverway runoff based on different basin hydrological process simulation results; 3, determining a flood event according to a flood event threshold value and the corresponding river channel runoff under different wetland distribution situations; extracting flood characteristics according to the flood event; and 4, quantitatively evaluating the flood regulation and storage function of the watershed wetland according to the flood characteristics. Through the wetland flood regulation and storage function, the construction of the watershed hydrological model coupled with the wetland module is firstlycarried out, so that the hydrological process simulation precision is greatly improved, and the watershed wetland flood regulation and storage function and the space-time difference thereof can be finely and quantitatively evaluated.

Description

technical field [0001] The invention relates to the technical field of wetland ecohydrology, in particular to a method for quantitatively evaluating flood regulation and storage functions of watershed wetlands. Background technique [0002] Wetland is an important part of water resources and water cycle in a basin, and is an important natural water storage space and regulator of water balance in a basin. Its function of flood regulation and storage is of great significance to maintaining water security in a basin. Wetlands have unique hydrological processes, which play a crucial role in understanding watershed-scale runoff generation and confluence. However, wetland hydrological processes are often neglected in watershed hydrological studies, and are not fully introduced in the development of many watershed hydrological models. This will further affect the simulation accuracy of hydrological processes and the precise regulation and decision-making of actual water resources, ...

AI Technical Summary

Problems solved by technology

However, due to: ① watershed hydrological model or hydrodynamic model cannot accurately describe the water balance of wetlands in the watershed, especially the hydrological processes of different wetland types; It is too large to be applied to the actual flood risk management and response in China; secondly, the existing theoretical methods and model techniques cannot carry out the adjustment of the flood process and its characteristics by wetland location and its type changes (isolated wetlands, riverside wetlands, etc.). Research on some international cutting-edge scientific issues such as the evaluation of storage effects

[0004] It can be seen that there is still a lack of more scientific and refined quantitative evaluation methods for flood regulation and storage functions of river basin wetlands

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