Method for calculating ecological water requirement of wetland for maintenance of ecological service functions

Abstract

The invention provides a method for calculating the ecological water requirement of a wetland for maintenance of ecological service functions. The method comprises the following steps of: firstly, carrying out quantitative evaluation on an ecological service function value of the wetland, and screening quantifiable key hydrological elements of the wetland; secondly, carrying out grey absolute correlation analysis and advantage analysis on the ecological service functions of the wetland and the key hydrological elements, and determining the importance sequence of the key hydrological elements; and finally, interpolating each key hydrological element and an ecological service function total value of the wetland by using a spline function, and determining the range of threshold values, which are in accordance with an optimum ecological service function value, of the wetland hydrological elements. By the method, the quantitative evaluation of the key hydrological elements of the wetland with the aim of maintaining a specific ecological service function value can be realized, and the defect that only water quantity or water level serves as a calculated result of the ecological water requirement of the wetland in the conventional calculation method is overcome at the same time; and the method provided by the invention more adapts to the complicated hydrological characteristics of the wetland.

Description

technical field [0001] The invention belongs to the field of resource and environment protection, and relates to a method for calculating wetland ecological water demand oriented to the maintenance of ecological service functions. Background technique [0002] Wetland ecological water demand is an important basis for maintaining the normal structure and function of its ecosystem. Reasonable determination of wetland ecological water demand and the use of hydrological elements to reshape wetland habitat are necessary conditions for maintaining the health of wetland ecosystems and are also inevitable for rational allocation of water resources. Require. At present, the research on ecological water demand of wetlands mostly stays in concept proposal and qualitative analysis. The specific estimation methods are mostly based on the principle of water balance, and the ecological water demand of wetlands is estimated according to classical hydrological calculation formulas, mainly in...

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Problems solved by technology

Wetlands are mostly ecosystems with complex hydrological conditions. The research results of wetland ecological water demand (annual water demand or annual average water level) obtained by the above methods are difficult to guide wetland water resources management, and often lead to the failure of wetland system restoration and maintenance due to too single results. One-sidedness

In recent years, some foreign experts and scholars have also proposed the ecological water demand of wetlands oriented towards the near-natural flow state. This method tends to reshape the original state of wetlands while ignoring human factors. It is too idealistic and lacks a practical basis for wetland management decisions.

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