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Effect of flexible vegetation lodging on overland run‐off resistance
Author(s) -
Zhang Shengtang,
Liu Ying,
Wang Zhikai,
Li Guibao
Publication year - 2020
Publication title -
water and environment journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 37
eISSN - 1747-6593
pISSN - 1747-6585
DOI - 10.1111/wej.12529
Subject(s) - vegetation (pathology) , surface runoff , flow resistance , resistance (ecology) , environmental science , hydrology (agriculture) , flexibility (engineering) , flow (mathematics) , soil science , geology , geotechnical engineering , ecology , mathematics , geometry , medicine , statistics , pathology , biology
Vegetation is an important factor in overland run‐off. Due to its flexibility, the vegetation will often become lodged, which will change the characteristics of the flow. However, current studies of flow resistance from flexible vegetation are primarily limited to qualitative analyses. To study the quantitative relationship between the resistance coefficient λ and the vegetation lodging angle θ , an indoor simulation experiment was carried out. The results showed that λ gradually decreased with increasing θ under the same water depth. When the vegetation was unsubmerged, λ u increased as the depth of water increased under the same value of θ , while with completely submerged vegetation, λ s decreased with increasing water depth. In addition, quantitative formulas for the relationship between the lodging angle and the resistance coefficient were obtained via regression analysis for both submerged and unsubmerged vegetation.