Soil loss and runoff characteristics in response to varying underground fissure ratios on karst slopes with thin soil layers in Southwest China
Study region: Karst slopes with thin soil layers, southwest China. Study focus: Bedrock fissures can reallocate runoff and soil losses on karst slopes. However, the response of soil loss and runoff characteristics to bedrock surface fissure to the bedrock surface area ratio (RUF) on karst slopes wit...
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Elsevier
2025-04-01
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| Series: | Journal of Hydrology: Regional Studies |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214581825000497 |
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| author | Tianyang Li Yunfei Bi Lan Song Binghui He |
| author_facet | Tianyang Li Yunfei Bi Lan Song Binghui He |
| author_sort | Tianyang Li |
| collection | DOAJ |
| description | Study region: Karst slopes with thin soil layers, southwest China. Study focus: Bedrock fissures can reallocate runoff and soil losses on karst slopes. However, the response of soil loss and runoff characteristics to bedrock surface fissure to the bedrock surface area ratio (RUF) on karst slopes with thin soil layers remain unclear. This study assesses the runoff and soil loss characteristics on karst slopes with a thin soil layer under five RUF scenarios (0, 1, 2, 3, and 4 %), a single rainfall intensity of 1.0 mm min−1, and three slope gradients (10°, 15°, and 20°) through laboratory simulations. New hydrological insight for the region: The highest surface runoff rate was observed under the 0 % RUF scenario at all slopes. Whereas the highest fissure runoff rate was found under the 4 % RUF scenario at the 15° slope. In contrast, the highest surface soil loss rates were found under the 1, 2, and 0 % RUF scenarios at the 10°, 15°, and 20° slope, respectively. The 2 % RUF scenario exhibited a significantly higher underground soil leakage loss rate at the 10° slope than that under other simulation scenarios. The surface runoff-to-total runoff and surface soil loss-to-total soil loss ratios under different scenarios ranged from 45.4 % to 78.3 % and 86.5–96 %, respectively. These results underscore that RUF redirects runoff, thereby modifying surface soil and leakage losses on karst slopes. |
| format | Article |
| id | doaj-art-1aae7a8282a9489eb01517452f3f55a4 |
| institution | Kabale University |
| issn | 2214-5818 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | Elsevier |
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| series | Journal of Hydrology: Regional Studies |
| spelling | doaj-art-1aae7a8282a9489eb01517452f3f55a42025-02-07T04:47:36ZengElsevierJournal of Hydrology: Regional Studies2214-58182025-04-0158102225Soil loss and runoff characteristics in response to varying underground fissure ratios on karst slopes with thin soil layers in Southwest ChinaTianyang Li0Yunfei Bi1Lan Song2Binghui He3College of Resources and Environment, Southwest University, Chongqing 400715, China; Key Laboratory of River and Lake Regulation and Flood Control in the Middle and Lower Reaches of Ministry of Water Resource of the People’s Republic of China, Changjiang River Scientific Research Institute, Wuhan 430010, ChinaCollege of Resources and Environment, Southwest University, Chongqing 400715, ChinaCollege of Resources and Environment, Southwest University, Chongqing 400715, ChinaCollege of Resources and Environment, Southwest University, Chongqing 400715, China; Correspondence to: College of Resources and Environment, Southwest University, 2 Tiansheng Road, Beibei District, Chongqing 400715, China.Study region: Karst slopes with thin soil layers, southwest China. Study focus: Bedrock fissures can reallocate runoff and soil losses on karst slopes. However, the response of soil loss and runoff characteristics to bedrock surface fissure to the bedrock surface area ratio (RUF) on karst slopes with thin soil layers remain unclear. This study assesses the runoff and soil loss characteristics on karst slopes with a thin soil layer under five RUF scenarios (0, 1, 2, 3, and 4 %), a single rainfall intensity of 1.0 mm min−1, and three slope gradients (10°, 15°, and 20°) through laboratory simulations. New hydrological insight for the region: The highest surface runoff rate was observed under the 0 % RUF scenario at all slopes. Whereas the highest fissure runoff rate was found under the 4 % RUF scenario at the 15° slope. In contrast, the highest surface soil loss rates were found under the 1, 2, and 0 % RUF scenarios at the 10°, 15°, and 20° slope, respectively. The 2 % RUF scenario exhibited a significantly higher underground soil leakage loss rate at the 10° slope than that under other simulation scenarios. The surface runoff-to-total runoff and surface soil loss-to-total soil loss ratios under different scenarios ranged from 45.4 % to 78.3 % and 86.5–96 %, respectively. These results underscore that RUF redirects runoff, thereby modifying surface soil and leakage losses on karst slopes.http://www.sciencedirect.com/science/article/pii/S2214581825000497Soil erosionLeakage lossWater reallocationBedrocksKarst slopes |
| spellingShingle | Tianyang Li Yunfei Bi Lan Song Binghui He Soil loss and runoff characteristics in response to varying underground fissure ratios on karst slopes with thin soil layers in Southwest China Journal of Hydrology: Regional Studies Soil erosion Leakage loss Water reallocation Bedrocks Karst slopes |
| title | Soil loss and runoff characteristics in response to varying underground fissure ratios on karst slopes with thin soil layers in Southwest China |
| title_full | Soil loss and runoff characteristics in response to varying underground fissure ratios on karst slopes with thin soil layers in Southwest China |
| title_fullStr | Soil loss and runoff characteristics in response to varying underground fissure ratios on karst slopes with thin soil layers in Southwest China |
| title_full_unstemmed | Soil loss and runoff characteristics in response to varying underground fissure ratios on karst slopes with thin soil layers in Southwest China |
| title_short | Soil loss and runoff characteristics in response to varying underground fissure ratios on karst slopes with thin soil layers in Southwest China |
| title_sort | soil loss and runoff characteristics in response to varying underground fissure ratios on karst slopes with thin soil layers in southwest china |
| topic | Soil erosion Leakage loss Water reallocation Bedrocks Karst slopes |
| url | http://www.sciencedirect.com/science/article/pii/S2214581825000497 |
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