Mountain area river ecological runoff calculating and application method

Abstract

The invention discloses a mountain area river ecological runoff calculating and application method, and solves the problems that mountain area small and medium river annual rainfall distribution is not even, water inflow in a dry season is insufficient, and limited ecological runoff cannot satisfy wide and shallow riverbed full coverage and current continuity; the method comprises the following steps: using a Tennant method to calculate the minimum ecological runoff volume that satisfies the riverbed ecology system basic demands, wherein the minimum ecology flow cannot cover the whole riverbed and form certain depth in a non-flood season; using the minimum ecology flow as the design flow, and using a manning formula to calculate to-be-drilled width and depth of the main channel riverbed; drilling down the riverbed in the main channel of the riverbed according to the calculated width and depth. Engineering measures can narrow and deepen the riverbed, so limited ecological runoff can flow along the riverbed center in the non-flood season, thus preventing riverbed cutoff, ensuring river water body continuity, ensuring riverbed ecology flow, and satisfying mountain area river aquatic biology survival and multiplying basic demands.

Description

technical field [0001] The invention relates to a method for calculating and applying ecological runoff of rivers in mountainous areas, which is used for calculating ecological runoff of rivers and can be applied and guaranteed through engineering measures, and particularly relates to the technical field of calculation and ecological dispatching of ecological runoff of rivers in mountainous areas. Background technique [0002] Calculating and ensuring the ecological runoff of rivers is the basis of water resource allocation and ecological regulation, and an effective measure to protect river ecosystems and functions. There are many calculation methods for ecological runoff at home and abroad, such as the hydrological index method (also known as the historical flow method ), hydraulic method, habitat method, overall analysis method, etc. Different ecological flow estimation methods have their applicable conditions and scopes. For rivers in mountainous areas, due to the extrem...

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: To provide a calculation and application method for ecological runoff in mountainous rivers in view of the uneven distribution of precipitation in a year in small and medium-sized rivers in mountainous areas, the lack of incoming water in dry seasons, and the limited ecological runoff that cannot meet the full coverage of wide and shallow riverbeds and the continuity of water flow , first use the hydrological method (Tennant method) to calculate the minimum ecological runoff to meet the basic needs of the river ecosystem, take the minimum ecological flow as the design flow, dig the riverbed in the main channel area of ​​the river according to a certain width-depth ratio, use Mann Ning formula to calculate the width and depth of the river bed in the main channel area that should be dug down

Images