Effects of Biocrusts on Hydrodynamic Characteristics of Slope Flow in Hilly Regions of Loess Plateau
[Objective] The effects of biological soil crusts (biocrusts) on the hydrodynamic characteristics of slope flow were investigated in order to provide theoretical guidance for the study of biocrusts anti-erosive mechanism in hilly regions of the Loess Plateau. [Methods] The treatments of biocrusts co...
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Science Press
2022-04-01
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| Series: | Shuitu baochi tongbao |
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| Online Access: | http://stbctb.alljournal.com.cn/stbctben/article/abstract/20220203 |
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| author | Zhang Huini Wang Bing Zhang Baoqi Han Jianqiao Xu Huanhuan |
| author_facet | Zhang Huini Wang Bing Zhang Baoqi Han Jianqiao Xu Huanhuan |
| author_sort | Zhang Huini |
| collection | DOAJ |
| description | [Objective] The effects of biological soil crusts (biocrusts) on the hydrodynamic characteristics of slope flow were investigated in order to provide theoretical guidance for the study of biocrusts anti-erosive mechanism in hilly regions of the Loess Plateau. [Methods] The treatments of biocrusts coverage and destruction were set, and the artificial rainfall simulation experiments were conducted in this study. [Results] ① The slope flow of biocrusts coverage and destruction treatments was the laminar jet stream. ②The biocrusts coverage significantly reduced slope velocity, whereas increased shear stress, resistance coefficient, and stream power (p<0.05). Compared with the bare land, the slope velocity of algal crust and moss crust treatment decreased by 48.74% and 62.24%. The shear force, resistance coefficient, and stream power increased by 130.01% and 308.07%, 703.35% and 2532.01%, 21.16% and 57.43%, respectively. ③ Compared with the bare land, the resistance coefficient was no significant difference after the biocrusts were destroyed, whereas the flow velocity, shear stress, and stream power were significantly higher than the bare land (p<0.05). The slope velocity, shear stress, and stream power of the algae crust and moss crust treatments increased by 10.84% and 16.46%, 36.8% and 42.44%, 60.8 and 62.14%, respectively. [Conclusion] The biocrusts coverage increased slope flow resistance coefficient and decreased flow velocity. After the biocrusts were destroyed, the slope flow resistance coefficient was no different from the bare land, but the flow velocity increased. Furthermore, the biocrusts coverage and destruction treatment increased shear force and stream power of the slope flow, thereby increasing the runoff erosion energy. |
| format | Article |
| id | doaj-art-0c9dc9924fc64ad5b2c150d443d0bdf0 |
| institution | Kabale University |
| issn | 1000-288X |
| language | zho |
| publishDate | 2022-04-01 |
| publisher | Science Press |
| record_format | Article |
| series | Shuitu baochi tongbao |
| spelling | doaj-art-0c9dc9924fc64ad5b2c150d443d0bdf02024-12-30T03:45:36ZzhoScience PressShuitu baochi tongbao1000-288X2022-04-01422162110.13961/j.cnki.stbctb.2022.02.0031000-288X(2022)02-0016-06Effects of Biocrusts on Hydrodynamic Characteristics of Slope Flow in Hilly Regions of Loess PlateauZhang Huini0Wang Bing1Zhang Baoqi2Han Jianqiao3Xu Huanhuan4State Key Laboratory of Soil Erosion and Dryland Agriculture on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, ChinaState Key Laboratory of Soil Erosion and Dryland Agriculture on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, ChinaSupervision Bureau of Soil and Water Conservation, Xifeng Governance, Qingyang, Gansu 745000, ChinaState Key Laboratory of Soil Erosion and Dryland Agriculture on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, ChinaState Key Laboratory of Soil Erosion and Dryland Agriculture on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China[Objective] The effects of biological soil crusts (biocrusts) on the hydrodynamic characteristics of slope flow were investigated in order to provide theoretical guidance for the study of biocrusts anti-erosive mechanism in hilly regions of the Loess Plateau. [Methods] The treatments of biocrusts coverage and destruction were set, and the artificial rainfall simulation experiments were conducted in this study. [Results] ① The slope flow of biocrusts coverage and destruction treatments was the laminar jet stream. ②The biocrusts coverage significantly reduced slope velocity, whereas increased shear stress, resistance coefficient, and stream power (p<0.05). Compared with the bare land, the slope velocity of algal crust and moss crust treatment decreased by 48.74% and 62.24%. The shear force, resistance coefficient, and stream power increased by 130.01% and 308.07%, 703.35% and 2532.01%, 21.16% and 57.43%, respectively. ③ Compared with the bare land, the resistance coefficient was no significant difference after the biocrusts were destroyed, whereas the flow velocity, shear stress, and stream power were significantly higher than the bare land (p<0.05). The slope velocity, shear stress, and stream power of the algae crust and moss crust treatments increased by 10.84% and 16.46%, 36.8% and 42.44%, 60.8 and 62.14%, respectively. [Conclusion] The biocrusts coverage increased slope flow resistance coefficient and decreased flow velocity. After the biocrusts were destroyed, the slope flow resistance coefficient was no different from the bare land, but the flow velocity increased. Furthermore, the biocrusts coverage and destruction treatment increased shear force and stream power of the slope flow, thereby increasing the runoff erosion energy.http://stbctb.alljournal.com.cn/stbctben/article/abstract/20220203biological soil crustsalgae crustmoss crusthydrodynamicsbiocrusts destruction |
| spellingShingle | Zhang Huini Wang Bing Zhang Baoqi Han Jianqiao Xu Huanhuan Effects of Biocrusts on Hydrodynamic Characteristics of Slope Flow in Hilly Regions of Loess Plateau Shuitu baochi tongbao biological soil crusts algae crust moss crust hydrodynamics biocrusts destruction |
| title | Effects of Biocrusts on Hydrodynamic Characteristics of Slope Flow in Hilly Regions of Loess Plateau |
| title_full | Effects of Biocrusts on Hydrodynamic Characteristics of Slope Flow in Hilly Regions of Loess Plateau |
| title_fullStr | Effects of Biocrusts on Hydrodynamic Characteristics of Slope Flow in Hilly Regions of Loess Plateau |
| title_full_unstemmed | Effects of Biocrusts on Hydrodynamic Characteristics of Slope Flow in Hilly Regions of Loess Plateau |
| title_short | Effects of Biocrusts on Hydrodynamic Characteristics of Slope Flow in Hilly Regions of Loess Plateau |
| title_sort | effects of biocrusts on hydrodynamic characteristics of slope flow in hilly regions of loess plateau |
| topic | biological soil crusts algae crust moss crust hydrodynamics biocrusts destruction |
| url | http://stbctb.alljournal.com.cn/stbctben/article/abstract/20220203 |
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