西南薄土层岩溶边坡地下裂隙比变化对土壤流失径流特征的响应

IF 5 2区地球科学 Q1 WATER RESOURCES

Journal of Hydrology-Regional Studies Pub Date : 2025-02-05 DOI:10.1016/j.ejrh.2025.102225

Tianyang Li , Yunfei Bi , Lan Song , Binghui He

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引用次数: 0

摘要

研究西南地区薄土层岩溶边坡。研究重点：基岩裂缝可以重新分配喀斯特斜坡上的径流和土壤流失。然而，在薄土层岩溶边坡上，基岩表面裂隙对土壤流失和径流特征的响应对基岩表面积比的响应尚不清楚。本研究通过室内模拟，评估了5种RUF情景（0、1、2、3和4 %）下，单次降雨强度为1.0 mm min−1,3种坡度（10°、15°和20°）下，薄土层喀斯特坡面径流和土壤流失特征。在0 % RUF情景下，在所有斜坡上观察到最高的地表径流率。而在坡度为15°的4 % RUF情景下，裂缝径流率最高。坡度为10°、15°和20°时，地表土壤流失率分别为1、2和0 %。2 % RUF情景下，10°坡面地下土壤渗漏损失率显著高于其他模拟情景。不同情景下地表径流量占总径流量的比例为45.4% ~ 78.3% %，地表土壤流失量占总土壤流失量的比例为86.5 ~ 96% %。这些结果强调了RUF重新引导径流，从而改变喀斯特斜坡的表层土壤和渗漏损失。

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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 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.

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来源期刊

Journal of Hydrology-Regional Studies Earth and Planetary Sciences-Earth and Planetary Sciences (miscellaneous)

CiteScore

6.70

自引率

8.50%

发文量

284

审稿时长

60 days

期刊介绍： Journal of Hydrology: Regional Studies publishes original research papers enhancing the science of hydrology and aiming at region-specific problems, past and future conditions, analysis, review and solutions. The journal particularly welcomes research papers that deliver new insights into region-specific hydrological processes and responses to changing conditions, as well as contributions that incorporate interdisciplinarity and translational science.