Artificial interference river ecology water demand threshold value calculation method

A technology of ecological water demand and calculation method, which can be applied in calculation, water conservancy engineering, open-air water source survey, etc.

Inactive Publication Date: 2010-07-28
BEIJING NORMAL UNIVERSITY
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Problems solved by technology

However, the current habitat method rarely considers human disturbance, especially the construction and operation of a large ...

Method used

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  • Artificial interference river ecology water demand threshold value calculation method
  • Artificial interference river ecology water demand threshold value calculation method
  • Artificial interference river ecology water demand threshold value calculation method

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Embodiment

[0040] According to the above method, the threshold value of ecological water demand in the spring flood season was calculated for a river in northern my country. The annual average rainfall is 780 mm, which belongs to the semi-humid area, but the precipitation is unevenly distributed throughout the year, and the rainfall is concentrated in summer and autumn. The precipitation from July to August accounts for 44.7% of the annual precipitation. The uneven distribution of precipitation in a year determines the uneven distribution of runoff in a year, and the water volume varies greatly with seasons. From March to April is the spring flood, from July to September is the summer flood, and from November to February, the water level is relatively stable, which is the dry season. .

[0041]The target species is carp, which is common in the river. Consider the impact of water depth and current velocity on fish life to express the quality of fish habitat. The optimum water depth rang...

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Abstract

The invention relates to an ecology water demand threshold value calculation method, in particular to an artificial interference river ecology water demand threshold value calculation method, which belongs to the field of environment protection. The method of the invention comprises the following steps: using a habitat method as the basis; firstly, selecting a target species for obtaining a target species habitat suitability curve; constructing a hydraulic model for simulating the distribution conditions of factors such as water depth, flowing speed, substrates and the like of rivers under the condition of different runoffs; then, calculating the weighted usable area of the target species under the condition of different runoffs according to the target species habitat suitability curve for establishing the relationship between the runoff and the weighted usable area; next, utilizing historical hydrologic data for obtaining the time sequence of the target species habitat (the weighted usable area); and further, using an Mann-Kendall method for finding the catastrophe point of the weighted usable area, and determining the target species habitat change threshold value for obtaining the proper runoff threshold value of the target species, i.e. the river ecology water demand threshold value. The river ecology water demand threshold value calculation method constructed by the invention based on the habitat catastrophe analysis can provide proper ecology water demand threshold value for the river ecology protection, the ecology restoration and the hydraulic engineering ecological operation with great artificial interference.

Description

technical field [0001] The invention belongs to the field of environmental protection, and relates to a calculation method for an ecological water demand threshold, in particular to a calculation method for an artificially disturbed river ecological water demand threshold. Background technique [0002] Ecological water demand is of great significance for maintaining ecosystems, especially the structure and function of aquatic ecosystems. Human activities have a huge disturbing effect on river ecosystems, especially the construction and operation of a large number of water conservancy projects, which have changed the shape and function of rivers and have a significant and extensive impact on river ecosystems. In order to deal with river ecological problems, protect and restore river ecosystems, it is necessary to develop appropriate calculation methods for ecological water demand. [0003] At present, there are many methods for calculating ecological water demand, which can ...

Claims

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Application Information

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IPC IPC(8): G06F19/00G01C13/00E02B1/00
Inventor 杨志峰于世伟陈贺杨薇
Owner BEIJING NORMAL UNIVERSITY
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