年输沙量

陕北黄土丘陵沟壑区总面积447万km2，水土流失极为严重，年输沙量达66亿t。

The gullied rolling loess region in northern Shaanxi is the region of severe soil and water loss with area of 44 700 km 2 and annual sediment production of 660 million tons .

悬移质年输沙量的30%是由为数不多的几场降雨造成的。

A few storms contribute 30 % of yearly suspended sediment discharge .

淤泥质海岸年输沙量的估算方法及其在海岸工程中的应用

A method for estimating the quantity of sediment transport on the foreshore with silt material and its application on Coastal Engineering

年输沙量总体减少，河水含沙量增大，泥沙淤积严重；

Sediment load per year decreased generally , sediment concentration of water increased , and the sand silting up was serious ;

从总体上看，年输沙量和年径流量都表现出随时间而减小的趋势，梯田、造林、种草和淤地坝拦沙造地4项水土保持措施面积随时间增大的趋势极其显著。

Both annual sediment load and annual river flow show a decreasing trend with time , and the areas of soil and water conservation measures .

有潮海淤泥质海岸的沿岸泥沙年输沙量目前尚无比较成熟的计算方法。

Up to now there aren 't relatively complete methods for estimating alongshore quantity of sediment transport on the foreshore with tide and silt material .

输沙量季节集中的程度更大，最大月输沙量占年输沙量的71.23%，最大月径流量占年径流量的39.22%。

The sediment discharge is much more concentrative than the runoff in the season . The maximum monthly sediment discharge is 71.23 percent of yearly sediment discharge . And the maximum monthly runoff is only 39.22 percent of yearly runoff .

通过对嘉陵江北碚站多年平均径流量和输沙量的统计分析发现嘉陵江年均径流量和输沙量关系变化可分为4个时段，各时段年输沙量有明显递减。

Based on the statistical analysis on the average annual runoff and sediment load at Beibei station in Jialing River , it is found that the correlative relationship between the average annual runoff and sediment load therein has four stages with distinct degressions of the sediment loads .

全省水土流失面积1375万km2，年平均输沙量92亿t，占全国水土流失总量的1/5，截至2000年底，全省已治理水土流失面积85万km2。

There is soil and water erosion area of 137 500 km 2 in Shaanxi province with annual average sediment transportation of 920 million tons that account for one fifth of total soil and water loss in China .

结果表明：泾河流域近50年来的输沙量略有下降，而径流量减少比较显著；

Results show that sediment yield decrease slightly but runoff yield increase obviously of Jinghe watershed nearly 50 years ;

51年来珠江流域输沙量的变化

Variation of Sediment Discharge of the Pearl River Basin from 1955 to 2005

长江宜昌站年悬移质输沙量均值估计

Estimation on the Mean of Annual Suspended Sediment Discharge for the Yichang Station on the Yangtze River

本文应用水文随机模拟方法，对长江宜昌站年悬移质输沙量均值进行了抽样误差估计，并用其它三种方法分析了均值的变化范围。

In this paper , the sampling error on the mean of annual suspended sediment discharge for the Yichang station on the Yangtze River has been estimated by use of the hydrologic stochastic simulation , and the variation ranges of the mean have been analysed by other three methods .

90年代是1950年以来黄河上中游径流总量最少的十年，而输沙量较80年代有所增加。

The total runoff in 1990s is the least since 1950 , but compared with 1980s , the sediment in 1990s increased a little .