天山乌鲁木齐河源区倒石堆浅论

倒石堆是一种重要的山地地貌类型。作者于1985—1987年对天山乌鲁木齐河源区倒石堆的成因、类型、组构进行了实地考察,并重复定位观察了倒石堆岩屑运动速度,对野外所获资料及数据经分析处理后,得出若干结果。

A SUPERFICIAL DISCUSSION OF TALUS AT THE HEAD OF URUMQI RIVER, TIAN SHAN

Three kinds of talus (rockfall-type, alluvial-type and protalus rampart-type) were found in this region.Rockfall-type was main influenced by gravitational force, so the smaller debris tended to stop on the talus, whereas the larger ones may reach its base. Both of AB plane and A axis were in accordance with its sedimentary direction. Its m-oving velocity was more than 100.0 cm/year.The melted water of ice and snow posessed an important influence for forming alluvial talus, you can see that the larger debris tended to stop on the talus, whereas the smaller ones may reach its base. Although its AB plane was in accordance with its sedimentary direction, but its A axis was nearly perpendicular to that direction. Its moving velocity was 146.0cm/year on southern slope, 73.0cm/year on northern slope.Its shape and structure was different from talus for protalus rampart, which had become a rock glacier. Because of influence of creeping of its inner frozen 1-ayer contained ice, so, all of its AB plane and A axis were in accordance with themselves own sedimentary direction. Its moving velocity was 11.2cm/year or so.