Investigation and Consideration on Gravity Erosion During July 15,2022 Rainstorm in Xiji County
On July 13-16,2022,a heavy rainfall occurred in the middle reaches of the Yellow River.Severe disaster caused by local heavy rainfall in Xiji County,Ningxia on July 15.In order to scientifically evaluate the damage of soil and water loss and the role of soil and water conservation engineering caused by this heavy rainfall,the Soil and Water Conservation Monitoring Center of the Ministry of Water Resources promptly organized an investigation.The gravity erosion special investigation used a combination of drone image interpretation and on-site ver-ification to obtain the location,area and erosion amount of gravity erosion in five typical small watersheds in Tangjiahe watershed of Xiji County.The statistics and analysis of the survey results show that this heavy rainfall has caused 120 gravity erosion in five small watersheds,including 85 collapses,29 landslides and 6 debris flows,mainly in newly built terraces,roads and grassland.The gravity erosion intensity of the rainstorm is 300-1 500 t/km2.One of the reasons for serious gravity erosion is the low standard of construction of water and soil conserva-tion engineering measures and incomplete supporting facilities system.Suggestions are put forward to appropriately improve the construction standards of soil and water conservation projects,pay attention to the protection of terraced fields and ridges,and strengthen the construction of road and ditch drainage facilities.
gravity erosionsoil and water conservation engineeringunmanned aerial vehicle image interpretationTangjia River BasinXiji County
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