Calculation method for ecological water requirement of affected plain area river network

Abstract

The invention discloses a calculation method for the ecological water requirement of an affected plain area river network, and provides a river ecological water requirement calculation method suitable for the affected plain area river network and constructed based on attached diatom indicative characters. The method includes the steps that survey spot positions and survey frequency are determined first; an attached diatom integrality index and a threshold value interval in a river network region are determined secondly; the quantitative analysis relation between the attached diatom integrality index of survey spots and a monthly averaged river flow rate measured actually is set up, and ecological flow rate control values in a river channel for maintaining different target ecological flow rates are determined correspondingly according to the threshold value interval of the attached diatom integrality index; according to flow cross sections determined by the different ecological flow rate control values and the annual average month-by month water level of the river channel, ecological flow rates for maintaining different healthy targets in the river channel, of all months are determined. Key technology support can be provided for determining a corresponding ecological water requirement control target for river ecological health maintenance and water conservancy project regulation and control of the plain river network area greatly affected by human activities.

Description

technical field [0001] The invention relates to the technical field of ecological environment protection, in particular to a calculation method for determining the ecological water demand of rivers in disturbed plain river network areas based on the indicator characteristics of attached diatoms. Background technique [0002] The plain river network area is flat, with dense water networks and connected river networks. The water ecosystem has common characteristics due to continuity; at the same time, due to the small river gradient and low self-purification capacity of the water body, under the influence of human disturbance, especially the regulation of water conservancy projects Influenced by various factors, although the flow of water in the river channel is related to factors such as seasons and other factors such as water level difference and flow change of connected rivers inside and outside the river network, it is obviously different from the natural state; the water e...

AI Technical Summary

Problems solved by technology

Due to human interference, the characteristics of the water ecosystem in the plain river network area are quite different from the natural state. Poor water quality, intervened hydrological conditions, and other human activities have caused rare fish species, sensitive benthic organisms and other species to be basically extinct. , making it difficult to establish ecological water demand targets based on these sensitive biological conditions and their characteristics

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