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首页> 外文会议>International Conference on Water and Environment(WE-2003); 20031215-18; Bhopal(IN) >Simulation Of Runoff And Sediment Yields From Sloppy Land In North East India Using A Physically Based Model
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Simulation Of Runoff And Sediment Yields From Sloppy Land In North East India Using A Physically Based Model

机译：基于物理模型的印度东北湿地产流产沙模拟。

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Ecological balance and sustainability of agriculture in the north eastern India are being threatened due to practice of shifting cultivation. For successful planning and execution of programs aimed for providing viable alternative to the shifting cultivation, simulation of future scenario of management practices and quantification of soil erosion and runoff from the fields under shifting cultivation and its alternate farming system is essential. In the present study, agriculture on the bench-terraced land was considered as one of the main 'alternatives to the shifting cultivation. Considering the fact that most of the watersheds in the area are unguaged and lack of availability of sufficient database, modeling approach was adopted to quantify the soil erosion and runoff from the fields under shifting cultivation, agriculture with conservation measures, and undisturbed natural vegetation. Water Erosion Prediction Project (WEPP) Watershed Model ver: 2002 was selected to describe the erosion processes on hillslopes considering its state-of-the-art- technology. The model was reasonably calibrated based on a comparison between measured and simulated runoff for three land uses viz; shifting cultivation, agriculture with conservation measures and undisturbed natural vegetation. Calibrated model was run for event-based prediction of runoff and soil loss. The model over-predicted the small values of runoff and under-predicted the large values of runoff. Sensitivity analysis indicated that runoff is very sensitive to the Manning's roughness coefficient, initial saturation lever of the soil and effective hydraulic conductivity. Nash - Sutcliffe model efficiency and root mean square error ranged from 65 to 76% and 51.3 to 63.9, respectively, for all the three land uses. The conservation measures helped in reducing the sediment yield from 36.6 kg per ha per mm of rainfall from shifting cultivation field to 8.6kg. On the basis of the results obtained from the present study it Can be inferred that the WEPP model can be used with reasonable accuracy, to simulate different management practices on hillslope for development and management planning of a hilly watershed.
机译：由于种植方式的转移，印度东北部的生态平衡和农业的可持续性受到威胁。为了成功地计划和执行旨在为轮作栽培提供可行替代方案的计划，模拟管理实践的未来方案以及量化轮作栽培及其替代耕作制度下田地的土壤侵蚀和径流至关重要。在本研究中，在梯田土地上的农业被认为是轮换耕作的主要“替代品”之一。考虑到该地区大部分流域都处于未受控制的状态，并且缺乏足够的数据库，因此采用建模方法对轮耕，农业采取保护措施以及自然植被不受干扰的田地的土壤侵蚀和径流进行量化。考虑到其最先进的技术，选择了水蚀预测项目（WEPP）2002年分水岭模型来描述山坡的侵蚀过程。根据对三种土地利用的测得径流量和模拟径流量的比较，对模型进行了合理的校准。转移种植，采取保护措施的农业和不受干扰的自然植被。运行校准模型以对径流和土壤流失进行基于事件的预测。该模型高估了径流的较小值，而低估了径流的较大值。敏感性分析表明，径流对曼宁的粗糙度系数，土壤初始饱和度和有效水力传导率非常敏感。纳什-苏特克利夫模型的效率和均方根误差在这三种土地用途上的范围分别为65％至76％和51.3至63.9。养护措施有助于将沉积物产量从每公顷降雨36.6千克/公顷的降雨从耕地转移到8.6千克/公顷。根据本研究的结果，可以推断出WEPP模型可以以合理的精度使用，以模拟不同的坡度管理实践，以开发和管理丘陵流域。

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