鄂东南崩岗崩壁溯源侵蚀特征研究

Study of headward erosion characteristics of collapsed downland in granite region in southeast Hubei Province

为科学研究崩岗侵蚀机理,并提出合理有效的崩岗治理措施,采用野外试验与室内分析相结合的方法,对湖北通城县五里镇的两个典型崩岗崩壁溯源侵蚀进行了监测,并分析了相关影响因素。结果表明:崩壁溯源侵蚀是崩岗侵蚀最主要的特征;崩壁溯源侵蚀与降雨量和强雨强度密切相关,但不呈线性关系,同时也与崩岗侵蚀高程和植被覆盖度的变化有关。龛的出现和发展是导致崩壁溯源侵蚀的重要因素,龛越发育,则崩岗发生越快。治理崩岗的关键在于防止发生崩壁溯源侵蚀。

To study the erosion mechanism of downland collapse and put forward effective treatment measures,by field test and laboratory analysis,the headward erosion of two typical downland collapses,Wuli Town in Tongcheng County of Hubei Province,is monitored and the related influence factors are analyzed. The results show that the downland headward erosion is the main feature of the collapse mound erosion; there is a nonlinear relationship among the downland headward erosion,rainfall volume and rainfall intensity,also the downland headward erosion is related with variation of the erosion elevation and the vegetation coverage. The occurrence and development of niche is the main cause for downland headward erosion. The more vigorously the niche develops,the faster the hill collapses. So,the key of downland collapse governance is to prevent the downland headward erosion.