Arrangement method of boulder stepped structure for treating riverbed undercutting of erodible channel segment of mountainous river

Abstract

The invention provides an arrangement method of a boulder stepped structure for treating riverbed undercutting of an erodible channel segment of a mountainous river. The arrangement method comprises the following steps: firstly, constructing a first physical model by taking a target channel segment as a prototype; secondly, determining the selection range of boulders; thirdly, paving the bouldersto construct a second physical model, and determining base boulder control areas; fourthly, introducing water current into the first physical model and the second physical model for eroding until thebed surface is stabilized, then selecting longitudinal sections and drawing morphometric maps of all the longitudinal sections after the bed surface is stabilized; sixthly, calculating average riverbed erosion resisting efficiency lambdap of all the longitudinal sections in all the base boulder control areas; seventhly, adjusting the boulder paving positions or / and boulder sizes of all the base boulder control areas, enabling the lambdap to be smaller than lambdamax, and the lambdamax to be equal to 0.3 to 1 in all the base boulder control areas, calculating the sizes of the boulders planningto be paved on the target channel segment by taking the second physical model as a basis, selecting the boulders, and paving the boulders into the target channel segment according a pavement mode identical with the second physical model as the basis.

Description

technical field [0001] The invention belongs to the field of undercut treatment of local river beds in mountain rivers, and relates to a boulder ladder structure arrangement method for treating undercut river beds in scour river sections of mountain rivers. Background technique [0002] As a mountainous country, my country has many mountain rivers and abundant water resources. Compared with plain alluvial rivers, mountain rivers have complex topography and fragmented geological conditions. The riverbed will cause instability of the bank slope, destroy the roadbed and bridges along the river, and cause collapse, landslide and debris flow disasters under the action of heavy rain and flood during the flood season. In addition, the instability of the riverbed will also cause drastic changes in aquatic habitats and inhibit river ecology. development. [0003] At present, the remediation plan for the lower section of mountain rivers often starts from the hydrogeological and geomorp...

AI Technical Summary

Problems solved by technology

However, under the influence of severe disaster damage and human activities, it is often out of balance, and then the artificial ladder deep pool structure is unreasonably laid, which may cause artificial damage to the natural riverbed system

Therefore, due to the self-regulating negative feedback mechanism of the river system and the complex flow state of mountainous rivers, it is risky to participate in river bed movement and lay artificial ladder deep pools for governance or protection.

However, in the prior art, there is no feasible and reliable index to directly evaluate the rationality of artificial ladder laying and to guide and optimize the layout of artificial ladders when laying artificial ladder deep pools for treatment or protection. blindness

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