泥石流、冰碛和河湖沉积物的粒度特征及判别

PRELIMILARY EXPLORATION ON GRAIN CHARACTERISTIC AND DISCRIMINATION OF DEBRIS FLOW DEPOSIT , MORAINE AND RIVER & LAKE DEPOSIT

根据福克（Ｆｏｌｋ）公式，计算出几个典型地区泥石流、冰碛和河湖沉积物的粒度特征参数，用核心区域图解法和判别分析方法认识和分析参数的分布特征和联系，初步建立判别的图形模型和数学模型，用以反推和判别参数反映的沉积类型和沉积环境。

Few research results on how to deduce and determine the corresponding deposit types and enviromments of sediment are satisfied though much research work has been done due to their monotonous and unintelligible qualitative methods.In accordance with the grain characteristic parameters of debris flow deposit,moraine and river_lake deposit in four typical regions,which are obtained with Folk formula,this article analyzes the distributing characteristics and the relationships between these parameters by means of core_area graphic method and discriminatory_analytical method,then,a prelimilary discriminatory model of graph has been established as the following. 1.the discriminatory model of graph is “Fig 2;the relationbetween the parameters of grain characteristics” and“ Table 1 the analytical result of the three deposits′ parmeters”,respectively. 2.the discriminatory equations for the deposits of deris flow(df),moraine(mr),and river_lake(rl)are: Y( df:mr )=0.86486Mz-0.70819Q-5.01804S k+0.01084K Y<-2.6415,for df;Y>-2.6415, for mr Y( df:rl )=0.71345Mz-4.04274Q+0.18417S k-0.52035K Y<-11.8405, for df ;Y>-11.8405, for rl Y( mr:rl )=-0.07021Mz-7.6609Q+0.09191S k-1.98192K Y<-23.4333, for mr ;Y>-23.4333, for rl Using the model,one can confer to deduce and determine the corresponding deposit types and environments of sediment.