Hydraulics determination method for utilization range and flood control safety position of compound beach land of mountain river

Abstract

The invention provides a hydraulics determination method for the utilization range and the flood control safety position of a compound beach land of a mountain river, which comprises the following steps: (1) calculating the corresponding flow when different values are taken for the relative water level under the condition of different effective water passing widths of a left beach land and a rightbeach land, and drawing the water level-flow relation graph of a typical section; (2) according to the designed flow of the target river reach and the designed flood control relative water level, calculating the maximum available width of the compound beach land in combination with the water level-flow relation graph; and (3) after determining the actual utilization width of the left beach land and the actual utilization width of the right beach land, calculating the corresponding flow when different values are taken for the relative water level, drawing the water level-flow relation curve, and determining the flood control safety relative water level in combination with the designed flow of the target river reach and the designed flood control relative water level, wherein the position located above the flood control safety relative water level is the flood control safety position.

Description

technical field [0001] The invention belongs to the fields of river beach utilization and mountain torrent disaster prevention and control in mountainous areas, and relates to a hydraulic determination method for the use range of compound beach lands and flood control safety positions of mountainous rivers. Background technique [0002] my country is a mountainous country. The rivers in mountainous areas are constrained by topographic conditions, as well as the steep rise and fall of floods and the change of incoming sediment, forming a compound river form. The river flats are often used by residents as cultivated land, and sometimes the river flats are also used to build residential housing. The watershed area of ​​my country's mountainous areas is 100km 2 There are about 50,000 rivers above, and the compound floodplain formed by them is the main usable area for people's living and agricultural production in the mountainous watershed. There are more than 1,500 county-level...

AI Technical Summary

Problems solved by technology

However, affected by the water blocking effect of crops and buildings on the beach, the water passing area under the same water level is reduced, which in turn leads to the reduction of the flood discharge capacity of the compound river channel, which often causes the flood discharge capacity of the river near the beach. Building flooding disaster

At present, residents in mountainous watersheds lack scientific basis for the use of compound flats, there is no scientific method to guide the usable range of flats, and there is also a lack of appropriate methods to delineate the safe location of the shore area near the flats, so it is difficult Determining the safe range of beach land use often causes flooding and disasters in mountainous rivers and compound beaches after use. Due to the unreasonable range of beach land use, shore buildings, roads, and cultivated land near the beach land are also frequently flooded.

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