bed-material load meaning in Chinese

底负载

The analyzed results are as follows : the late 1960 ' s cutoff of riverbends increased both the runoff amount and the sediment transport amount of the lower reach of jingjiang river , while the sediment deposition decreased in the lkngting lake area ; after the mid 1980 ' s , both the middle reach of yangtze river main stem and the dongting lake occurred a trend of decreasing annual sediment transport as a result of decreasing sediment releasing from the upper reach of yangtze river ; and in the recent 3 years ( 2003 - 2006 ) , the three gorges reservoir first impoundment additionally reduced the sediment concentration in the middle reach of yangtze river flow with a long time , so a distance would be quite long for suspended sediment recovery , but the distance for bed - material load of suspended sediment recovery would be quite short
分析结果表明： 20世纪60年代下荆江裁弯后，三口（松滋口、太平口、藕池口）分流分沙减少，下荆江径流量和输沙量相应增加，洞庭湖泥沙淤积减少； 80年代中期以后，长江中游干流及洞庭湖出口的年输沙量呈减少趋势，城陵矶至武汉河段河床由淤积转为趋向冲淤平衡；三峡工程初期蓄水运用后，长江中游含沙量沿程恢复距离较长，但床沙质部分恢复距离相对较短。