基于IDRISI的水土流失污染及低影响开发模拟

发布时间：2018-06-08 21:28

本文选题：低影响开发 + 面源污染　；参考：《环境科学与技术》2016年S2期

【摘要】：水土流失是陆源径流污染和面源污染的重要因素,低影响开发(LID)对减轻新建城区水污染至关重要。在规划前采取模型预景可提升水土流失污染的治理效果。以长沙市某新城片区为例,基于水土流失污染防治探讨低影响开发决策。首先,基于IDRISI模块利用修正的通用土壤流失方程(RUSLE)对基地现状进行模拟,得出平均土壤侵蚀模数、土壤侵蚀分级和水系沉积物负荷,并诊断现状水土流失污染的重点区位,引导LID设施布局;对LID规划方案进行模拟,通过规划前后指标的变化揭示该方案对水土流失污染防治的实效。结论:规划将使平均土壤侵蚀模数降低37.84%,侵蚀等级达极强和剧烈的比例分别下降72.04%和85.85%,西北片流域和东南片流域的沉积物总量分别下降32.72%和30.10%。
[Abstract]:Soil erosion is an important factor of land runoff pollution and non-point source pollution. Low impact development of LIDs is very important to reduce water pollution in newly built urban areas. Adopting model preview before planning can improve the effect of soil and water loss pollution control. Taking a new town in Changsha as an example, the low impact development decision was discussed based on soil erosion pollution prevention and control. First of all, based on IDRISI module, the current situation of the base is simulated by using the modified universal soil loss equation (RUSL), and the average soil erosion modulus, soil erosion classification and sediment load of water system are obtained, and the key location of current soil erosion pollution is diagnosed. To guide the layout of lid facilities, simulate the plan of lid planning, and reveal the effectiveness of the scheme in the prevention and control of soil erosion pollution through the change of indexes before and after planning. Conclusion: the planning will reduce the average soil erosion modulus by 37.84%, decrease the proportion of erosion grade to extremely strong and violent by 72.04% and 85.85%, and decrease the total sediment content of Northwest and Southeast watershed by 32.72% and 30.10%, respectively.
【作者单位】：上海市政工程设计研究总院(集团)有限公司;
【分类号】：X52

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