Quantitative calculation method for flood storage and detention effect of coal mining subsidence area

Abstract

The invention discloses a quantitative calculation method for the flood storage and detention effect of a coal mining subsidence area. The method comprises the steps that the natural inflow daily average flow of a riverway connected with the coal mining subsidence area is acquired, and the daily natural inflow of the riverway is calculated according to the natural inflow daily average flow of the riverway; the reservoir capacity corresponding to the design flood level of the coal mining subsidence area is acquired, the dead reservoir capacity of the coal mining subsidence area is acquired, and the flood volume corresponding to the flood control level of the riverway connected with the coal mining subsidence area is acquired; the flood storage and detention effect of the coal mining subsidence area is quantitatively calculated according to the natural inflow daily average flow of the riverway, the reservoir capacity corresponding to the design flood level, the dead reservoir capacity and the flood volume corresponding to the flood control level of the riverway. The situation that the flood storage and detention effect of the coal mining subsidence area can be derived only by carrying out a large number of observation experiments for a long time is omitted, the work cost is reduced, the research difficulty is lowered, the flood storage and peak clipping effect of the coal mining subsidence area under the given conditions is shown more visually, and a positive effect is achieved for relieving local flood disasters.

Description

technical field [0001] The invention relates to the technical field of water conservancy, in particular to a quantitative calculation method for flood storage and detention effects in coal mining subsidence areas. Background technique [0002] The coal mining subsidence area is due to the goaf formed by coal seam mining that destroys the original stress balance of the surrounding rock mass, resulting in surface subsidence, causing a large area of ​​water to accumulate on the surface of the plain mining area, which not only reduces the available land resources, but also affects ground facilities, ecological environment and local conditions. Residents' lives are also affected to varying degrees. [0003] The climate around some coal mining subsidence areas is complex and changeable, with large interannual precipitation changes and extremely uneven distribution within a year, forming typical regional drought and flood characteristics with little precipitation, easy drought, hea...

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Problems solved by technology

[0004] At present, foreign research on coal mining subsidence areas mainly focuses on land reclamation and comprehensive management, mainly after backfilling, leveling, and restoration of soil structure in the depressions in the subsidence area, and then developing the subsidence area into forest land, grassland, Agricultural land, biological habitats and other places that are beneficial to the natural environment; some coal mining subsidence areas in China are mostly used as water storage reservoirs. Comprehensive treatment methods, geological environmental impacts, and comprehensive utilization of water resources in subsidence areas are the focus of scholars' research. There are many studies on the allocation of water resources, but there are few studies on the effect of flood storage and detention in coal mining subsidence areas, especially the quantitative calculation of the peak shaving effect of coal mining subsidence areas on floods is rare

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