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Method for rapidly analyzing season difference of ecological water need

A technology for rapid analysis of ecological water demand, applied in water conservancy projects, open-air water source surveys, water conservancy engineering equipment, etc. Calculation method scientific and reasonable effect

Inactive Publication Date: 2011-04-27
BEIJING NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the requirements for habitat environmental elements in the biological reproduction period with the most prominent contradiction between ecology and production water demand are taken as the ecological objectives of the critical period, and the ecological water demand in the critical period is determined according to the relationship between the ecological objectives and runoff in the critical period, and then the multi-year average natural water demand is used. The annual time change rate of runoff is used as the annual time change target of ecological water demand to determine the seasonal difference of ecological water demand, realize the rapid analysis of seasonal difference requirements of ecological water demand, and effectively solve the problem of large calculation workload of ecological water demand considering seasonal differences

Method used

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  • Method for rapidly analyzing season difference of ecological water need
  • Method for rapidly analyzing season difference of ecological water need
  • Method for rapidly analyzing season difference of ecological water need

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Effect test

Embodiment approach

[0013] Firstly, the key ecological objectives are determined, and the ecological water demand is determined by establishing the relationship between the parameters of the ecological objectives and the runoff. The present invention divides the ecological target into two parts, the critical period ecological target and the time change target.

[0014] 1) Calculation of ecological water demand in critical period

[0015] The ecological goals of typical organisms in the ecosystem to the habitat are mainly reflected in two aspects: flow velocity and water depth. The relationship between flow velocity, water depth and river runoff can be determined by using the measured data on the relationship between typical river flow velocity, flow section and water depth. For rivers with relatively regular sections, Manning’s formula can be used to establish the relationship between flow velocity, water depth and river runoff, and then determine the ecological environment water demand in the c...

example 1

[0030] The specific implementation of the present invention is illustrated by taking the calculation of ecological water demand in different seasons of a typical river course in northern my country as an example. According to the annual time distribution of the average natural runoff of the river for many years and the calculation formula (2), the proportion of ecological water demand in each month to the annual total is calculated. Among them, there were two peaks in August and March respectively. The requirements for the habitat environment in the initial stage of biological reproduction in April, when the water demand contradiction of the ecosystem is the most prominent, were selected as the ecological goals of the critical period. According to the different requirements of the physical environment of the spawning ground on the water flow velocity, the target parameter of the organism to the water body flow velocity is selected as 0.15m·s -1 ~0.7m·s -1 . According to the...

example 2

[0037] The typical benthic organisms in the estuary and the Chinese sturgeon were selected as indicator species to determine the ecological water demand target in the critical period of the estuary. At the same time, the temporal change law of natural runoff was used as the temporal change target of ecological water demand to maintain the natural rhythm of the ecological hydrological process. The calculated annual ecological water requirements for ideal, suitable and minimum grades are 919.1×10 9 , 705.9×10 9 and 593.3×10 9 m 3 . The attached figure shows the calculated change of ecological water demand in different seasons of the year. From May to October, the proportion of ecological water demand is relatively high, accounting for more than 70% of the annual total.

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Abstract

The invention provides a method for rapidly analyzing ecological water need season difference. Aiming at the deficiency that different types of ecological water need computation methods can not rapidly analyze the ecological water need time difference under the condition of the lack of ecological and hydrological related information of an ecological system at present, an ecological target the ecological system of which changes following the time is divided into a critical period ecological target and a water need quantity and time change target. The requirement of the biological reproduction period with obvious contradiction of ecological need water and production need water on habitat environment factors is used as a critical period ecological target, and the critical period ecological water need quantity is determined; and an average natural runoff annual time change rate for years is used as a critical period ecological target, finally, the ecological water need season difference is determined, thereby meeting the requirement of rapidly analyzing the ecological water need season difference. The invention avoids complex computational effort and information quantity demand and effectively achieves the purpose of rapidly analyzing the ecological water need season difference.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for quickly analyzing seasonal differences in ecological water demand, which solves the demand for calculation data and heavy workload of ecological water demand in different seasons, and is difficult to be directly applied to water resource allocation and ecological environment restoration in different seasons question. Background technique [0002] In the process of rapid social and economic development, due to irrational development and utilization of water resources, wetland ecosystems such as rivers, lakes, and estuaries are in short supply of water, resulting in increasingly serious problems of ecological degradation. In recent years, while causing serious negative impacts on the balance of ecosystems at different scales, ecological degradation has become a key constraint factor for the sustainable development of regional society and ec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00G01C13/00E02B1/00
Inventor 杨志峰孙涛
Owner BEIJING NORMAL UNIVERSITY
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