【摘要】 田湾河流域易发生泥石流,近年来发生泥石流的分布在其左右岸呈现较大差异,左岸发生过泥石流的沟谷数远小于右岸。通过实地考察,获取流域的特征数据,对沟谷比降特征和水系发育情况进行分析。研究发现,田湾河右岸的沟床比降为"先缓后陡"型,而左岸沟谷为"先陡后缓"型,后者沟谷发育更趋于成熟,沟谷形态相对稳定,不易发生泥石流;左右岸Horton比均在合理范围,然而右岸水系更加发育且右岸沟谷形态尚不稳定,右岸的各级Horton比的变幅较左岸大,河网形态对泥石流触发有不同影响。更多还原

【Abstract】 The Tianwan River Basin is prone to occur debris flow. In recent years,the distribution of debris flow in the basin is quite different between the left bank and the right bank. The number of gully where debris flow occurred on the left bank is much smaller than that on the right bank. Through on-the-spot investigation,the characteristic data of the basin are obtained,and the characteristics of the gully gradient and the development of the water system are analyzed. It is found that the gully gradient on the right bank of Tianwan River is " first slow and then steep",while that on the left bank is " first steep and then slow". the latter is more mature,and the shape of gully is correspondingly stable so that debris flow is not easy to occur; the ratio of Horton on both banks is in a reasonable range,but the right bank is more developed and the shape of gully on the right bank is still unstable,and the variation of Horton ratio at all levels on the right bank is larger than that on the left bank. The shape of river network has different triggering effects on debris flow.更多还原