崩岗侵蚀调查方法的探讨

Approach to the methods of surveying collapsing hill erosion

崩岗是我国南方红壤丘陵区的一种严重的水土流失形式。在江西赣南水土流失区发育得较为普遍。不但对坡面土地生产力造成破坏，同时也排泻大量泥沙，淤埋农田和河道。为有效地控制崩岗侵蚀，必须在治理现有水土流失的同时，十分积极有效地预防新的侵蚀乃至崩岗的发生。崩岗侵蚀调查的目的，在于为上述工作提供可靠的依据。崩岗调查的内容应包括：一地区基本情况、崩岗发生的部位和面积、坡面侵蚀现状、崩岗边缘距分水岭、距陡壁高度和倾角、悬空体比例、堆积物情况及流通段泥沙特性等，通过对上述因子的综合分析，评定崩岗现有侵蚀规模及程度，并预测崩岗继续发展的可能性及潜在胁威，将评定的侵蚀程度和侵蚀强度绘制成崩岗侵蚀图，从而为科学地制定治理规划及合理配置治理措施以及有效控制崩岗侵蚀打下基础．

Collapsing hill,a kind of serious soil erosion forrns in krasnozem hillyregion of south China,occurs widespreadly in south Jiangxi Province,Not onlydistroy the productive capacity on land slopes.It aiso pol1r a great quantities ofmudsand to the farm land and channel.In order to control soil and water losseffectually,first,bringing the existing erosion under control,second, preventthe new erosion happening.The surveing collapsing hill contains,The region ger-eral case,the position and area of collapsing hill; the altitude and inclination ofthe distance from the edge of collapsing site to the top of hill cliff;the ratio ofhanging soil lnass,the state of accretion; the flowing mud---sand character;etc.On the base of analysing con1prehensively, evaluate the scale and extent of existing collapsing hill,Forecast the continuative developmental possibility of collapsi-ng hill and it’s potential menace,With the result obtaind,Trace a picture of collapsing erosion。Thus,Lay foundation for scientifically enact the control planning,for reasonabey collcecate the control measures,and for control the collapsinghill erosion.