System for confirming vegetation bed bottom resistance and confirming method

Abstract

The invention discloses a system and a method for confirming vegetation bed bottom resistance. The system comprises a circulating variable slope water tank system for simulating urban rivers, a simulating vegetation fixing system and a physical quantity measuring system. The confirming method includes: 1) forming a vegetation belt, and placing a plastic plate provided with vegetations in an inserting mode at the bottom of a water tank; 2) controlling the incoming flow by adjusting a frequency variable pump; 3) calculating a corresponding bottom slope; 4) calculating the volume ratio of the vegetations to the water body; 5) closing the frequency variable pump, removing the vegetations on the plastic plate, and starting the variable frequency pump again to control the incoming flow; and 6) calculating a corresponding bottom slope. The system has the advantages of: 1) being capable of simulating the urban rivers of different hydraulic conditions through the variable slope circulating water tank system; 2) being capable of simulating natural subsistent vegetations of different types through the vegetation fixing system, and simulating the vegetations of different distribution modes and different density; and 3) obtaining the resistance of the vegetation river bottom under different hydraulic conditions, and providing river planning and designing specifications for relevant cities.

Description

technical field [0001] The invention relates to a resistance system and a determination method for determining the bottom resistance of a vegetation river bed, belonging to the technical field of environmental hydraulics. Background technique [0002] A city is the center of a region's economic, political, and cultural development, and occupies an important position in the course of human development. With the continuous development of my country's social economy, the process of urbanization is also getting faster and faster. At present, the level of urbanization in my country is close to 50%. The natural and artificial rivers flowing through the city are important channels for material circulation in the hydrodynamic system and play an important role in the planning, establishment and development of the city. In the process of urban modernization, people urgently need to live in harmony with rivers, and the five-in-one urban water ecological model of "water security, water...

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Problems solved by technology

[0004] 1) The calculation of flood resistance is inaccurate, and the flood capacity is overestimated, which increases the risk of flooding in urban rivers and easily leads to flood disasters;

[0005] 2) The resistance at the bottom of the river bed is closely related to sediment movement, and inaccurate estimation of it may easily cause sediment deposition and reduce the flow capacity of the river channel;

[0006] 3) Neglecting the resistance at the bottom of the river bed will lead to deviations in the calculation of vegetation resistance, thereby misestimating the ability of water flow to diffuse and transport pollutants, and increasing the risk of urban river pollution

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