WANG Yingyu. Water Distribution Characteristics of Highway Slope Greening Under Irrigation and Rainfall Conditions[J]. 2018, 32(4): 128-132.
DOI:
WANG Yingyu. Water Distribution Characteristics of Highway Slope Greening Under Irrigation and Rainfall Conditions[J]. 2018, 32(4): 128-132. DOI: 10.13870/j.cnki.stbcxb.2018.04.020.
Water Distribution Characteristics of Highway Slope Greening Under Irrigation and Rainfall Conditions
bottom leakage and soil storage were measured by the method of soil spraying
and the water distribution on slope was analyzed under irrigation and rainfall conditions. The results showed that the distribution of soil cracks on slope was not uniform
and the soil cracks tended to decrease from the top slope to the bottom. The total area of cracks on sunny slope was greater than that on the shady slope. Water distribution characteristics under irrigation condition varied from different slope directions. On the sunny slope
0.02% of the water was dissipated through evapotranspiration
7.00% of the irrigation water moved along the slope forming surface runoff
10.00% of water turned into the bottom leakage and 53.00% of the irrigation water was stored in soil. The ratios of evapotranspiration
surface runoff
bottom leakage and soil moisture were 0.01%
35.00%
0.25% and 39.00% on the shady slope respectively. With the growth of vegetation coverage
the surface runoff formed by irrigation decreased and the soil water storage increased. Rainfall intensity had a significant effect on water distribution characteristics. About 95.00% of the rainfall was stored in the soil under the light rain
and the amount of bottom leakage and surface runoff reached the maximum under moderate and heavy rain conditions respectively. With various rainfall intensities
surface runoff on shady slopes was 1.1~3.0 times higher than sunny slopes. The sunny slopes had a higher water use efficiency with greater amount of bottom leakage than the shady slopes. These results could provide a scientific reference for the effective use of water in the highway slope greening.