Lake and reservoir channel storage curve determining method based on hydrometry

Abstract

The invention discloses a lake and reservoir channel storage curve determining method based on hydrometry. The lake and reservoir channel storage curve determining method includes the steps that water volume conservativeness inspection and correction of flow observation data are conducted; an inlet average daily water level model of a river way is determined on the basis of hydrometry data within the water level rise and fall period with the inlet average daily flow, the outlet average daily flow and the outlet average daily water level as parameters; the lake and reservoir channel storage process within the typical hydrologic year water level rise and fall period is calculated day by day, and the channel storage amount of each date is obtained; the function relationship between the channel storage amounts and represented water levels is determined; and a channel storage curve family is drawn according to the function relationship of the channel storage amounts and the represented water levels. According to the lake and reservoir channel storage curve determining method, the semi-empirical function relationship of the channel storage curves is derived according to the hydraulics principle, the clear physical meanings are achieved, the lake and reservoir channel storage curves with the water level as the independent variable and with the flow as the parameters can be determined with the help of the conventional hydrometry data of the river way, and a low-cost convenient route is provided for estimation of the lake and reservoir channel storage amounts.

Description

technical field [0001] The invention belongs to the technical field of water conservancy engineering, and in particular relates to a method for determining the storage curve of a lake reservoir based on hydrological observation. Background technique [0002] The channel-storage curve of a lake or reservoir is the main basis for flow calculation in the lake area (reservoir area), and is widely used in hydrological forecasting. Whether the curve can be reasonably determined will directly affect the feasibility and accuracy of the lake outflow forecast. At present, for a single channel with a stable water level and flow relationship, the relationship curve between the inlet and outlet flow and the tank storage can be directly established, and the flow calculation can be carried out through mature methods such as the Muskingum method. This process does not require river topography data, which is very convenient. For lake-reservoir-type rivers whose outlet water level is obviou...

AI Technical Summary

Problems solved by technology

This method is not only costly, but also implies the assumption that the water level difference between the upstream and downstream of the lake and reservoir is 0, and cannot reflect the change of dynamic storage capacity under different flows. It is only suitable for reservoirs with large water depth, low flow velocity, and approximately horizontal water surface.

In the case of river-type lakes with small water depth and obvious water surface drop, it will cause obvious errors, and it cannot be applied in areas where topographic data is missing.

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