Plain river network water volume replacement rate calculation method based on remote sensing image, and terminal

Abstract

The invention discloses a plain river network water volume replacement rate calculation method based on a remote sensing image, and a terminal. The method comprises the following steps: establishing a water surface area-water level fitting relation between the water surface area of a plain river network enclosure water system and the water level of the water system through the remote sensing image; calculating a first water volume from the lowest water level of the plain river network enclosure water system to the water level of each water system by a difference method, calculating a second water volume below the lowest water level by a volume generalization formula method, and adding the first water volume and the second water volume to obtain the total water volume of the enclosure water system corresponding to each water level of the water system; establishing a water level-water volume fitting relation and a water surface area-water volume fitting relation of the plain river network enclosing area water system; and then obtaining the total water volume of the current enclosed area water system at the current moment according to the fitting relationship, so as to calculate the water volume replacement rate. According to the method, the water volume replacement rate can be obtained in real time, the precision of the method meets the calculation requirement of river network water system water volume mass exchange, the surrounding area water volume scheduling condition can be mastered in time, and the method has high practicability.

Description

technical field [0001] The invention relates to the technical field of water ecological environment management, in particular to a method and a terminal for calculating the water displacement rate of plain river networks based on remote sensing images. Background technique [0002] Water replacement is the process of introducing new water to replace old water. It is an important method to improve the water environment of the river network. The water replacement rate is the proportion of new water to the total water. Its size reflects the degree of water replacement and is an important indicator for evaluating the effect of water quality improvement. index. [0003] The calculation methods of the water exchange rate are mainly the water quality model simulation method and the remote sensing method of estimating the river water volume. Among them, the water quality model, also known as the water quality mathematical model, is a mathematical description of the water quality ch...

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Problems solved by technology

[0006] The above-mentioned remote sensing estimation method is difficult to measure the river runoff, especially in the plain river network, it is difficult to have enough measurement stations, and the data of the flow station is used for relationship analysis, and it can only solve the control area of ​​the station, and cannot Calculate the entire drainage area

Based on the above reasons, the existing methods have the problems of difficulty in obtaining the measured river boundary conditions, inaccurateness and heavy modeling workload, which will lead to the dilemma of being divorced from reality and difficult to apply

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