Calculation method of ecological water demand of wetland based on evaluation of disturbance degree of ecological system

A technology for ecological water needs and ecological systems, which is applied in calculations, measuring devices, water conservancy projects, etc., to achieve the effects of strong operability, simple calculation methods, and easy popularization and application

Inactive Publication Date: 2011-01-12
BEIJING NORMAL UNIVERSITY
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Problems solved by technology

[0006] The present invention aims at the lack of a simple and feasible calculation method for wetland ecological water demand that can link the health status of the ecosyste

Method used

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  • Calculation method of ecological water demand of wetland based on evaluation of disturbance degree of ecological system
  • Calculation method of ecological water demand of wetland based on evaluation of disturbance degree of ecological system
  • Calculation method of ecological water demand of wetland based on evaluation of disturbance degree of ecological system

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Embodiment

[0043] The implementation steps and effects of this patent are described in detail by using a suitable ecological water demand calculation example of a typical wetland in northern my country.

[0044] (1) According to the relationship between water level and water surface area of ​​a certain wetland (see figure 2 shown), and the rate of change of the water surface area with the change of the water level was calculated (see image 3 shown). From the water surface area change rate curve, it can be seen that the water levels corresponding to the maximum water surface area change rate are 7.5m and 8.3m, and these two water levels are the key water levels for the change of wetland water surface area.

[0045] (2) Taking 7.5m as the ecological water level in the non-flood season (October-May) and 8.3m as the ecological water level in the flood season (June-September), construct the initial ecological water level scheme.

[0046] (3) Using the M-K method to analyze the sudden chan...

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Abstract

The invention relates to a calculation method of the ecological water demand of a wetland based on the evaluation of the disturbance degree of an ecological system. The calculation method comprises the following steps: firstly analyzing the morphological features of the wetland, obtaining the key water level affecting the change of the area of water surface of the wetland according to the change rate of the area of the water surface of the wetland along with the change of the water level, and constructing a plurality of ecological water level schemes including the initial ecological water level scheme according to the key water level and the discrete result thereof; then applying the Mann-Kendall method to analyze water level time sequential value, finding out a mutation point of the change of the water level to determine the water level state under the natural condition; and further carrying out modified hydrological index evaluation on all the water level schemes on the basis, determining a series of wetland appropriate ecological water level schemes achieving the requirements on the health status of the ecological system and finally determining appropriate ecological water demand schemes. The calculation method can provide a series of the appropriate ecological water demand schemes which are applicable to different water supply conditions, ensure that the ecological system can not degenerate severely due to water shortage in different periods and lead the operability in the water resource management and configuration to be stronger.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a method for calculating the suitable ecological water demand of wetlands based on the evaluation of the disturbance degree of the ecological system. It can effectively solve the problem that wetland ecological water demand analysis technology is difficult to quickly and accurately determine the appropriate ecological water demand based on the health of the ecosystem under the current lack of data. Background technique [0002] In recent years, due to the intensification of human activities, the intensification of unreasonable water and soil resources development activities such as water diversion and reclamation of wetlands has led to the occupation of a large number of wetlands' ecological water needs, resulting in the continuous shrinking of wetlands, the reduction of biodiversity, and the occurrence of hydrological cycle processes. Profound changes and serious ...

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Application Information

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IPC IPC(8): G06F19/00G01C13/00E02B1/00
Inventor 杨志峰陈贺杨盈于世伟
Owner BEIJING NORMAL UNIVERSITY
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