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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Run-off generation from fields with different land use and land covers under extreme storm events
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Run-off generation from fields with different land use and land covers under extreme storm events

机译：在极端风暴事件下，从具有不同土地利用和土地覆盖的田间产生径流

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摘要

Land use and land covers (LULC) are known to influence hydrological processes like infiltration and runoff generation from the watersheds. We report here the effects of some common LULC types on run-off generation in North East India. LULC were found to be closely related to soil macroporosity and the resulting infiltration and surface run-off generation capacities under varying high-intensity rainfall events. The MACRO 5.0 model was used to simulate water transport through soils in both macropore and micropore domains. The model simulations revealed that LULC significantly influenced the moisture content and water flow rate in both the domains. Undisturbed forest soils, having a high degree of macroporosity, showed higher preferential flow and low run-off. However, paddy fields exhibited very high surface run-off due to lower infiltration owing to hard pan formation at a shallow depth. Soils under jhum cultivation showed significant number of active macropores in the upper soil layer, whereas the macropore connectivity was apparently lost in the lower horizons. Less infiltration of rainwater was observed in the grasslands, where the surface-initiated macropores were blocked by eroded, fine soil particles. Under extreme storm events, rainfall characteristics primarily controlled the run-off generation processes as the intake capacity of the soil macropores was exceeded.
机译：众所周知，土地利用和土地覆盖会影响水文过程，例如流域的入渗和径流产生。我们在此报告印度东北部一些常见的LULC类型对径流产生的影响。人们发现，在不同的高强度降雨事件下，LULC与土壤大孔隙度以及由此产生的入渗和地表径流产生能力密切相关。 MACRO 5.0模型用于模拟水在大孔和微孔区域中通过土壤的传输。模型仿真表明，LULC显着影响了两个域中的水分含量和水流速。高孔隙度的未扰动森林土壤表现出较高的优先流量和较低的径流。然而，由于在浅深度形成坚硬的盘，稻田的入渗量较低，因此其表层径流非常高。破土栽培的土壤在上层土壤层中有大量活跃的大孔，而在下层土壤中大孔的连通性显然消失了。在草原上观察到的雨水渗透较少，在这些草原上，表面侵蚀的大孔被侵蚀的细土壤颗粒阻塞了。在极端风暴事件下，由于土壤大孔的摄入量被超过，降雨特征主要控制了径流的产生过程。

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