赣北红壤丘陵区高压输电线路工程水土流失特征研究

Research on characteristics of soil and water loss of high voltage transmission line project in red soil hilly region of northern Jiangxi Province

为明确红壤山地丘陵区输电线路工程水土流失特征,以雅中~江西±800 kV特高压工程为研究对象,通过实地调查,对不同土地利用塔基部位侵蚀沟断面形态进行了研究。结果表明:(1)裸地、稀疏灌木地侵蚀沟沟深在0.05~0.25 m范围内的累积频率分别为82.76%、92.86%;横断面积在0.0025~0.01 m^(2)内的占比分别为37.9%和42.9%。(2)裸地侵蚀沟的平均长度和深度较草地、稀疏灌木地高出68.8%、30.9%和59.8%、18.8%;平均横断面积和体积从大到小依次为裸地>稀疏灌木地>草地;裸地、稀疏灌木地侵蚀沟断面特征表现为“窄且深”,而草地表现为“宽且浅”。(3)土地利用为裸地、稀疏灌木地的塔基部位侵蚀沟体积可通过宽深比进行估算。本研究可为该区同类项目水土流失量估算以及水土流失治理提供一定的理论依据。

In order to clarify the soil and water erosion characteristics of the transmission line project in the red soil hilly area,the Ya zhong~Jiang xi±800 kV UHV project was taken as the research object,and the cross-sectional morphology characteristics of the erosion grooves of the tower foundations of different land use were studied through field investigations.The results shows that:(1)The cumulative frequency of erosion of bare land and sparse shrubland within the range of 0.05~0.25m is 82.76%and 92.86%,respectively;the proportion of cross-sectional area within 0.0025~0.01 m^(2)is 37.9%and 42.9%,respectively.(2)The average length and depth of the bare slope erosion ditch is 68.8%,30.9%,59.8%,18.8%higher than that of grassland and sparse shrubland;the average cross-sectional area and volume from large to small are bare land>sparse shrubland>grassland.;the cross-section characteristics of the erosion gullies on bare land and sparse shrubland are"narrow and deep",while grassland is"wide and shallow".(3)The volume of the erosion ditch at the base of the tower where the land is used as bare land and sparse shrubland can be estimated by the ratio of width to depth of the erosion ditch.This study can provide a certain theoretical basis for the estimation of soil erosion amount and soil erosion control of similar projects in this area.