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Method for estimating ecological water amount of shallow lake under pollution stress

A technology of water demand and lakes, which is applied in calculation, water conservancy engineering, river regulation, etc.

Inactive Publication Date: 2010-10-13
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

The technical problem to be solved in the present invention is to establish a new method for determining ecological water demand. The ecological water demand determined based on this technology can meet the needs of lake water ecosystems under pollution stress and improve water ecosystems. important to repair

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  • Method for estimating ecological water amount of shallow lake under pollution stress
  • Method for estimating ecological water amount of shallow lake under pollution stress
  • Method for estimating ecological water amount of shallow lake under pollution stress

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Embodiment Construction

[0072] The present invention is further described below with a certain lake in northern my country as an implementation case.

[0073] (1) Preliminary determination of the ideal ecological water demand threshold

[0074] A shallow grass-shaped lake with four distinct seasons and good light and heat conditions is suitable for the reproduction of aquatic organisms. According to historical data and field investigation, it is determined that the main biological communities in this area are reeds, fish, plankton, benthic animals, etc., and then the ecological water level method is used to preliminarily determine that the annual average monthly minimum ecological water demand of the lake is 0.87×10 8 m 3 , the ideal ecological water demand is 2.78×10 8 m 3 .

[0075] (2) Determination of key water quality indicators

[0076] The pollution type of the lake is eutrophication, and the key water quality indicators are DO and BOD 5 , NH 4 -N, TN and TP. The water pollution status...

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Abstract

The invention provides a method for estimating the ecological water amount of a shallow lake under the pollution stress. The method comprises the following steps of: firstly, selecting a key ecological index and determining the ideal ecological water amount by adopting an ecological water level method; secondly, determining an important water quality index by means of a principal component analysis method and building a model of water quality simulation; thirdly, adopting a scenario analysis method on the base, i.e., stimulating the water environment information under different conditions through setting a certain combine scenes (including management objective, wastewater treatment level, conditions of inflow rate, conditions of outflow rate and the like); and finally, comprehensively determining the ecological water amount of the lake under the pollution stress by combining different management requirements and ecological water levels. The action of pollution stress in the current situation is fully considered, the water quality model is coupled to the evaluation for the ecological water amount of the shallow lake, the ecological water amount of the shallow lake is estimated from water quality and water amount demand, so that the ecological water amount is more effectively applied to the actual water resources allocation, and the practicability of the method for estimating the ecological water amount is enhanced.

Description

technical field [0001] The invention belongs to the field of environmental protection and relates to a method for estimating the ecological water demand of shallow water lakes in consideration of pollution stress. Background technique [0002] Ecological water demand is an important factor that must be considered in water resources planning and allocation and ecosystem protection. The determination of reasonable ecological water demand is conducive to the rational allocation of water resources and the maintenance of the health of the entire aquatic ecosystem. Existing methods for determining ecological water demand mostly focus on rivers, such as the runoff period curve method, 7Q10 method, and Tennant method based on hydrological analysis; the R method based on hydraulic parameters 2 CROSS method, wet perimeter method; IFIM method based on ecological basis, BBM method and overall evaluation method starting from the whole system, etc. At present, the methods for determining...

Claims

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Application Information

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IPC IPC(8): E02B1/00E02B3/02G06F19/00
CPCY02A90/10
Inventor 杨志峰郑冲杨薇
Owner BEIJING NORMAL UNIVERSITY
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