沟谷系统结构理论和实践意义的探讨──以川中丘陵区沟谷系统为例

Significance of Gullies System Structures in Theory and Practice,Exampled by Gullies Systems in the Central Hills of Sichuan

通过川中丘陵区５个沟道小流域的沟系形态结构分析，证实了沟谷系统是具有一定几何规律性和统计规律性的较稳定的有序结构，而且这种结构规律具有普遍性，认识加分析这些结构规律，可以揭示川中丘陵区沟系形成演化的机制。通过不同地貌流域的沟系结构的比较分析，发现沟系结构的一些数量指标具有指示流哉地貌发育阶段信息的意义。鉴此，作者提出了描述流域地貌发育的几个数指标（沟道上凹度、水源面积率和沟道平均落差比）。

This paper. by analysing morphological structures of gullies systems in the Central Hills ofSichuan. has verified that the gullies. systems are of ordered structures which show some geometricand statistic regularities. the conclusion is universal. and studying these regularities is a useful way tounderstand the mechanism of the evolution of gullies systems. Besides. the author. through compar-isons among gullies system strucures in different contexts of landforms. has revealed that some quan- titative criteria of gullies system structure laws are valuable to characterlze development stages oflandforms within watershed.From the discovery. the author has suggested that these quantitative cri-teria can be taken as indexcs Which indicate development stages of landforms within watershed. Andthese ideas will enrich quantitative researches on geomorphology and supply with reliable scientificdata for pratical appl ication.