[en] Canopy interception significantly affects hydrological processes such as infiltration, runoff and evapotranspiration. Research on grass canopy interception remains limited, and the experimental methods employed differ substantially. To thoroughly investigate the canopy interception characteristics of grass and clarify the methodological differences, five commonly utilized slope protection grass species in temperate regions were cultivated in a laboratory setting, and their canopy interception characteristics were experimentally investigated using the water-balance method (WBM), the water-wiping method (WWM) and the water-immersion method (WIM), respectively. The results showed that the WBM is more accurate for measuring canopy interception in grass, whereas both the WWM and the WIM underestimate grass canopy interception capacity. The canopy interception capacity measured by the WBM was 1.61-2.09 times higher than that of the WWM and 1.93-3.47 times higher than that of the WIM. Grey correlation analysis of the eight evaluated factors indicated that leaf area is the most influential factor affecting canopy interception in grass, followed by rainfall amount, dry mass, rainfall intensity, canopy projection area, leaf contact angle, fresh weight, and average height. There is a negative power function relationship between the interception ratio and the rainfall amount. With increasing rainfall intensity, the canopy interception capacity initially increases and then decreases, peaking at rainfall intensities of 15 to 20 mm/h. Leaf contact angle is a key quantifiable parameter that explains the differences in canopy interception among different grass species, and the canopy interception per unit leaf area decreases as the leaf contact angle increases. This study demonstrates that the WBM provides the most accurate measurements of grass canopy interception compared to the WWM and WIM, and highlights the leaf contact angle as a key factor in explaining interspecies differences. These findings could enhance the understanding of grass canopy interception and guide the selection of experimental methods.
Disciplines :
Civil engineering
Author, co-author :
Gao, Xu-Guang; Department of Hydraulic Engineering, School of Civil Engineering, Shandong University, Jingshi Road 17922, 250061 Jinan, China
Wang, Ji-Peng; Department of Hydraulic Engineering, School of Civil Engineering, Shandong University, Jingshi Road 17922, 250061 Jinan, China. Electronic address: ji-peng.wang@sdu.edu.cn
Ge, Shangqi; Department of Hydraulic Engineering, School of Civil Engineering, Shandong University, Jingshi Road 17922, 250061 Jinan, China
Su, Shuai-Kang; Department of Hydraulic Engineering, School of Civil Engineering, Shandong University, Jingshi Road 17922, 250061 Jinan, China
Bai, Mohan ; Université de Liège - ULiège > Urban and Environmental Engineering
François, Bertrand ; Université de Liège - ULiège > Urban and Environmental Engineering
Language :
English
Title :
Investigation of canopy interception characteristics in slope protection grasses: A laboratory experiment.
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