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1.
Li CHEN Qingquan LIU and Jiachun LI .. Division of Engineering Sciences Institute of Mechanics Chinese Academy of Sciences Beijing China E-mail: qqliu@mail.imech.ac.cn 《国际泥沙研究》2001,16(4)
1 mTRODUCT1ONThe Loess Plateau in the central and westem China with an area of 430,(X)0 lQn2 is well known for itsancient cultUre and serious soil and water loss. About 287,(X)0 km2 of area in this region has an annualerosion be greatC than 1(XX) tlkIn2. The eroded soil totally amounts to more than 2.2 X l0' tons, amongwhich about l.6X 10' tons, on average, is delivered into the Yellow kiver mdeng the river one of thehighest sediment-laden rivers in the word. The serious soil erosion … 相似文献
2.
ＥＦＦＥＣＴＯＦＡＮＮＵＡＬＲＡＩＮＦＡＬＬＡＮＤＲＵＮＯＦＦＣＯＭＰＯＳＩＴＩＯＮＯＮＳＥＤＩＭＥＮＴＹＩＥＬＤＩＮＳＭＡＬＬＷＡＴＥＲＳＨＥＤＳＳｌｏｂｏｄａｎＰＥＴＫＯＶＩＣａｎｄＪｏｖａｎＳＴＥＦＡＮＯＶＩＣ（ＰｒｏｆｅｓｓｏｒｏｆＨｙｄｒａ... 相似文献
3.
Quanxi XU Songsheng CHEN Ming XIONG Shengwei LI Zefang CHEN 《国际泥沙研究》2007,22(3):228-237
The Jialingjiang River basin is one of the main sediment contributing areas in the upper reaches of the Changjiang River. Great changes have taken place in the runoff and sediment discharge in recent years. Comparing the data of 1991-2003 with the data of 1954-1990, the annual runoff of the Jialingjiang River basin decreased by 23 %, and the suspended sediment transport decreased by 74% or 105 million tons. The main factors affecting the reduction include a decrease in rainfall, sediment detention of hydraulic structures, soil and water conservation activities, sedimentation and sand dredging in the river channel. Thorough investigation and analysis of the contribution of each factor to the sediment decrease at Beibei Station was determined for the first time. The following are the contributing percentages for each factor: a decrease in runoff accounted for 32.9%; soil and water conservation measures accounted for 16.4%; sediment detention of hydraulic structures accounted for 30.5%; sedimentation, river channel sand dredging, and other factors accounted for 20.2%. These findings are very important for forecasting the trend of inflow sediment discharge variation. 相似文献
4.
Tongxin ZHU 《国际泥沙研究》2002,17(4)
1 INTRODUCTION Soil crusting, or soil sealing, is one of the common phenomena in agricultural lands or semi-arid and arid soils. Due to the breakdown of soil aggregates by raindrops, soil surface develops a very thin, often less than a few millimeters, dense layer. Many studies indicated that such a thin layer significantly reduces infiltration capacity and increases surface runoff (i.e. McIntyre, 1958; Edward and Larson, 1969; Agassi et al., 1985; Bradford et al., 1986; Romkens et al.,… 相似文献
5.
Abstract The design and construction of a special-purpose laboratory catchment and rainfall simulator is described. The equipment consists of a soil catchment area that can be inclined at various angles. Additional instrumentation then measures the flow of water across the surface of, and through, the soil bed. Precipitation is provided by a unit that simulates rainfall at particular rates with uniform distribution. The equipment was used to examine infiltration, runoff and other hydrological properties of a number of soils under different rainfall intensities and with different catchment slopes. Correlations were obtained for these variables. 相似文献