Method for designing ecological flow of fishes in spawning period by base flow plus pulses

Abstract

The invention provides a method for designing ecological flow of fishes in a spawning period by base flow plus pulses. The method includes the steps: carrying out representative fish early-stage resource monitoring of a downstream river section of a reservoir; investigating the change of representative fish spawning and breeding conditions before and after reservoir water storage operation; analyzing the influence of hydrological situation change on representative fish spawning and propagation; identifying key hydrological element indexes influencing spawning and propagation of the fishes; adopting an ecological flow design thought of base flow + high flow (flood) pulse; and determining a basic flow according to a sustainability boundary method (SBA), and adding high-flow (or flood) pulseswith specific ecological significance on the basis of the basic flow to form a complete ecological flow demand, so that the design of the ecological flow in the spawning period of fishes is realized.

Description

technical field [0001] The invention relates to the research field of suitable ecological flow for aquatic organisms in river channels, in particular to a method for designing ecological flow in fish spawning period with base flow plus pulse. Background technique [0002] With the construction and operation of cascade reservoirs, the hydrological situation in the downstream reaches of the reservoirs has changed to a certain extent, which will inevitably have adverse effects on the fish living and breeding in the downstream reaches, especially those that are sensitive to changes in hydrological processes. Fish that lay floating eggs. Therefore, it is urgent to propose an ecological flow process that meets the needs of fish that produce drifting eggs. [0003] At present, the calculation methods of river ecological flow can be roughly divided into four categories, including: hydrology method, hydraulic method, habitat simulation method and overall analysis method. The hydrol...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the lack of ecological mechanisms in hydrology and hydraulics methods in the existing ecological flow calculation methods, the habitat simulation method and the integral method have high requirements for ecological data and complex calculations, based on the early fish resources (fish eggs) Based on the monitoring data of seedlings), an ecological flow design method of base flow plus pulse is proposed to meet the spawning requirements of drifting egg-laying fishes, so as to restore the key ecological hydrological processes affected by the operation of the reservoir, and to carry out the ecological regulation of cascade reservoirs. ,Promote the protection of fish resources and provide technical support

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