Wang Z.,Chinese Ministry of Water Resources |
Wang W.,Chinese Ministry of Water Resources |
Wang W.,Northwest Agriculture and Forestry University |
Luo T.,Northwest Agriculture and Forestry University |
And 2 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2010
A field scouring experiment on soil erosion and sediment yield on unpaved roads was conducted to provide scientific date for predicting and controlling soil and water loss on unpaved roads. Results indicated that the variation of sediment yield appeared in three types, which were smooth, multimodal, and unmoral distribution on the condition of combination of same slope with different runoff discharges, or same discharge with different slopes. Spatial variation of sediment yield with slope profile could be showed reduction in three types, wave, gradual reduction and reduction after increase on the same road surface. The variations of average sediment concentration with supplied runoff discharge were accorded with logarithmic correlations. But, variations of sediment yield rate with supplied runoff discharges, average sediment concentration with slope, sediment yield rate with slope were accorded with linear correlation. The result was prospected to provide theoretical foundation for research and predication in the soil erosion of unpaved roads.
Shi Q.-H.,Northwest Agriculture and Forestry University |
Wang W.-L.,Northwest Agriculture and Forestry University |
Wang W.-L.,Chinese Ministry of Water Resources |
Guo M.-M.,Northwest Agriculture and Forestry University |
And 5 more authors.
Chinese Journal of Applied Ecology | Year: 2015
Engineering accumulation formed in production and construction projects is characterized by unique structure and complex material composition. Characteristics of soil erosion on the engineering accumulation significantly differ from those on farmland. An artificially simulated rainfall experiment was carried out to investigate the effects of rainfall intensity on the processes of runoff and sediment yielding on the engineering accumulation of different gravel contents (0%, 10%, 20% and 30%) in red soil regions. Results showed that the initial time of runoff generation decreased with increases in rainfall intensity and gravel content, the decreased amplitudes being about 48.5%-77.9% and 4.2%-34.2%, respectively. The initial time was found to be a power function of rainfall intensity. Both runoff velocity and runoff rate manifested a trend of first rising and then in a steady state with runoff duration. Rainfall intensity was found to be the main factor influencing runoff velocity and runoff rate, whereas the influence of gravel content was not significant. About 10% of gravel content was determined to be a critical value in the influence of gravel content on runoff volume. For the underlying surface of 10% gravel content, the runoff volume was least at rainfall intensity of 1.0 mm·min-1 and maximum at rainfall intensity of greater than 1.0 mm·min-1. The runoff volume increased 10%-60% with increase in rainfall intensity. Sediment concentration showed a sharp decline in first 6 min and then in a stable state in rest of time. Influence of rainfall intensity on sediment concentration decreased as gravel content increased. Gravels could reduce sediment yield significantly at rainfall intensity of greater than 1.0 mm·min-1. Sediment yield was found to be a linear function of rainfall intensity and gravel content. ©, 2015, Editorial Board of Chinese Journal of Applied Ecology. All right reserved.
Ran D.-C.,Yellow River Institute of Hydraulic Research |
Ran D.-C.,CAS Institute of Soil and Water Conservation |
Zhao L.-Y.,Tianshui Soil and Water Conservation Experimental Station |
Zhang Z.-P.,Xifeng Soil and Water Conservation Experimental Station |
Luo Q.-H.,Xifeng Soil and Water Conservation Experimental Station
Shuili Xuebao/Journal of Hydraulic Engineering | Year: 2010
The effect of soil and water conservation measures on the slope on rill erosion with different scale in the Loess Plateau in the Middle Yellow River is quantatively analyzed. The results show that the action of rill erosion reduction due to soil and water conservation measures is more than that of reducing soil with infiltration and interception. In the small scale, the effect of soil and water conservation measures on slope can reduce rill erosion up to about 55%. In bigger scale, the soil and water conservation can reduce the rill erosion higher than the erosion reduction on slope by 1.1 to 1.25 times. The erosion reduction is about 29% of the total reduction by soil and water conservation in the valley. So, to reduce rill erosion by soil and water conservation on slope should be considered in calculating the reduced erosion by soil and water conservation measures in Loess Plateau around the Middle Yellow River.