Fish way inlet dispersed water feeding system arrangement method with bottom stilling pool

Abstract

The invention discloses a fish way inlet dispersed water feeding system arrangement method with a bottom stilling pool. The arrangement method comprises the following steps: a water feeding pipe is arranged from an upstream reservoir for leading water near a fish way inlet through a steel pipe; a water feeding stilling pool is excavated at the bottom of a rectangular channel section in the fish way inlet; the water is leaded to the stilling pool by the water feeding pipe; and the fed water overflows from the top after energy dissipation to feed the fish way inlet to meet fish inducing demands.The arrangement method has the following advantages: the overall place space is not additionally occupied; the traditional centralized water feeding and dispersed water feeding advantages are both achieved, so that the inlet water flowing speed is accelerated, and the influence on upstream fishes is lower; and a water feeding force dissipation system is simple in structure arrangement, and can beproperly adjusted according to specific engineering.

Description

technical field [0001] The invention proposes a method for arranging a decentralized water replenishment system at a fishway inlet with a stilling pool at the bottom, and belongs to the field of fishway engineering in dam crossing buildings. Background technique [0002] There are 98,000 reservoir dams in my country. These reservoir dams have brought huge social and economic benefits to human beings, but they also form a barrier to the migration of fish upstream and downstream of the hub, resulting in habitat fragmentation and changes in the habitat of fish. With the development of my country's economy, the country has paid more and more attention to ecological protection. In the "environment" field of key development in the "National Medium and Long-Term Science and Technology Development Plan (2006-2020)", it is clearly defined as "ecosystem function recovery and reconstruction” as a priority theme. In the construction of water conservancy, it is extremely important to pro...

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Problems solved by technology

This directly leads to a contradictory and mutually restrictive problem: the wider the entrance of the fishway, the easier it is for fish to find and enter the fishway; and the wider the entrance, the greater the cross-sectional velocity relative to the internal control section of the fishway. In addition, the flow rate of the fishway itself is very small, which may cause the flow velocity at the inlet of the fishway to be lower than the induction flow velocity of the fish in the river, which is extremely unfavorable for luring fish

Some experts and scholars have noticed this point, and have also proposed some measures to replenish water in the fishway, but there are still the following problems that need to be solved urgently: 1. In the traditional centralized water replenishment method, the water replenishment pipe is directly arranged at the entrance of the fishway, and the outlet of the water replenishment pipe is formed. Concentrated outflow and high water flow velocity often cause turbulent water flow near the entrance of the fishway, resulting in eddy currents, which make the fish lose their sense of direction and affect passing fish; The pipe network and each branch pipeline also need to be equipped with complicated equipment such as valves and flow monitoring and control instruments. Increase the flow rate of local fishway ponds, resulting in an increase in the flow velocity of the control section of the fishway downstream of the replenishment area, or even exceeding the standard, which is not conducive to the smooth upward movement of fish

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