含沙河流入湖后沙体形成、发展的水槽实验  

FLUME EXPERIMENT ON FORMATION AND DEVELOPMENT OF SANDBODIES IN LAKE WITH SANDBEARING VARIETY OF RIVER

作　　者：王泽中[1] 汪崎生 刘忠保[1] 

机构地区：[1]江汉石油学院地质系

出　　处：《石油与天然气地质》1991年第4期426-438,共13页Oil & Gas Geology

摘　　要：含沙河流入湖后,沙体首先在河口呈舌形向前发展。上游来沙时、沙体前积、侧积几乎同样发育且速率相等或相似,沙体表面以一条河道为主,近河口一侧为淤,远河口一侧为冲;若上游不来沙,沙体则只有侧积而没有前积,沙体表面存在多条分支河道,近河口端为冲,远河口端为淤,河道分流主要发生在y=30—60cm之间,其后却有闭合的趋势。六次实验的沙体的最大宽度都集中在距河口距离为河道宽度三倍的断面上,最大厚度集中在距河口150cm的断面上。Experimental facilities include a 3.5×0.2×0.6m flume, a 5.0×2.5×0.6mbasin, a sand feeding device and a water circulating system. The sands, with grain-sizeranges 0.25 to 0.42 mm, were tuken from the Yangtze River. The independent slope ofthe flume and basin was predetermined, but the water discharge (Q), the sand discharge(Q_s), and the water levels in the basin were varied between runs. The results of six experiments showed that the sandbodies developed as lingulate format the beginning. When the sand was fed, the progradation and lateral deposition deve-loped almost at the same rate, and the rate depended on Q and Q_s. When no sand wasfed, there was no progradation but the lateral deposition rate was great, and this rate alsodepended on Q. However, the water discharge (Q) was not related to the rate of area. Inall the six-run experiments, the maximum width of the sandbodies located at a distance of60 cm from the river mouth; the maximum thickness located at a distance of 150 cm fromthe mouth. A balance point of erosion and deposition existed between 30--50 cm from themouth. When sand was fed, the near mouth side received deposition and the other sideeroded; when sand was not fed, things were opposite. The erosion and deposition cycleresulted in the creation of new channels. The main channel began to separate between30--60 cm and rejoined at 120 cm from the mouth. In other words, the distributarymouth bars were easy to form at a distance of 30--60 cm from the mouth.

关 键 词：河流 沙体 湖泊 油气勘探 

分 类 号：P618.130.2[天文地球—矿床学]