Evaluation method of lake water storage variables based on multi-temporal remote sensing images and dem

Abstract

The invention discloses a lake water volume storage variable assessment method based on a multi-temporal remote-sensing image and a DEM. The lake water volume storage variable assessment method comprises the following steps that (A) the lake areas in a current region within two time periods are calculated; (B) a reservoir capacity-area relation curve of the depression where a lake is located in the current region within two time periods is calculated; (C) the lake areas in the current region within the two time periods and the reservoir capacity-area relation curve of the lake corresponding to the lake areas are read to obtain the water storage capability of the lake in the current time period; (D) the difference of the reservoir capacities of the lake within two time periods is calculated to serve as a lake water volume storage variable. According to the scheme, quantified description of the shrinking or expanding degree of the lake can be achieved based on the calculated water volume storage variable, the lake water volume storage variable assessment method has the important significance on climatic change research and regional water resource evolution tendency, and meanwhile the lake water storage capability change has a certain supporting effect on the research of water circulation elements of a drainage basin and is conductive to social sustainable development.

Description

technical field [0001] The invention relates to a method for evaluating lake water storage variables in two time periods, in particular to an evaluation method for lake water storage variables based on multi-temporal remote sensing images and DEM. Background technique [0002] Lakes participate in the natural water cycle and are extremely sensitive to climate changes. Changes in the area and water content of lakes will change the conditions of the underlying surface, thereby affecting atmospheric circulation. Therefore, lakes can be used as indicators of regional climate change to a certain extent; Lakes also have multiple functions such as regulating runoff, providing water, and improving regional ecological environment; therefore, it is of great significance to the study of lake evolution. [0003] At present, the research on the evolution of lakes mainly focuses on the change of lake water surface area, which is achieved by extracting lake images of different ages through...

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Problems solved by technology

[0003] At present, the research on the evolution of lakes mainly focuses on the change of lake water surface area, which is achieved by extracting lake images of different ages through satellite remote sensing technology, analyzing and calculating the area to determine the extent of lake expansion or shrinkage; the research on lake water volume changes is briefly There is a shortage. At present, artificial field surveying and mapping, that is, water balance and model simulation methods are generally used to calculate the lake water volume. In these two methods, there are different degrees of uncertainty in the calculation of other water elements except lake water. Difficult to provide support for research on regional climate change and water cycle evolution

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