• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >MODELING SOIL EROSION AND SEDIMENTATION ON SMALL AGRICULTURAL WATERSHEDS.
【24h】

MODELING SOIL EROSION AND SEDIMENTATION ON SMALL AGRICULTURAL WATERSHEDS.

机译：对小农业流域土壤侵蚀和沉降的模拟。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Two mathematical modeling approaches, distributed-system and lumped-system, were used for simulating watershed hydrology and temporal variations of watershed sediment yields. Major upland erosion processes as well as physical characteristics of natural rainfall were reviewed and modeled. Based on the results from upland erosion models, a distributed-system sedimentation model was developed and coupled with the ANSWERS hydrologic model (Beasley and Huggins, 1980). A lumped-system hydrologic model was developed from the general hydrologic system model of Chow and Kulandaiswamy (1971). A lumped-system sediment discharge model was developed from physically-based assumptions for a watershed sedimentation system. These four models were tested with field data from small agricultural watersheds of less than 20 ha in size.The distributed-system sedimentation model was developed so that the parameters may be approximated using factors for the universal soil loss equation. Optimal parameters were less than those determined from the factors. Splash erosion and flow erosion are linearly additive in the model. It also simulates spatial variations of soil erosion within a watershed, which can be useful for determining management practices to reduce soil erosion and sediment loads. The dynamic lumped-system sediment discharge model was developed so that sediment discharge is related to simple hydrologic parameters. Both models simulated actual data very well.Hydrologic simulation results from ANSWERS and the lumped-system hydrologic model were comparable with field data. The ANSWERS simulation results were sensitive to changes in parameters. The lumped-system model was nonlinear since the parameters vary with storm characteristics. Both the models were applicable to small watersheds.
机译：两种数学建模方法分别是分布式系统和集总系统，用于模拟流域水文和流域沉积物产量的时间变化。审查和建模了主要的山地侵蚀过程以及自然降雨的物理特征。根据山地侵蚀模型的结果，开发了分布式系统的沉积模型，并与ANSWERS水文模型相结合（Beasley和Huggins，1980）。从Chow和Kulandaiswamy（1971）的一般水文系统模型建立了集总系统水文模型。基于集水区沉积系统的基于物理的假设，建立了集总系统沉积物排放模型。对这四个模型进行了试验，使用了小于20公顷的小型农业流域的现场数据。建立了分布式系统沉积模型，以便可以使用通用土壤流失方程的因素来估算参数。最佳参数小于从这些因素确定的参数。飞溅侵蚀和流动侵蚀在模型中是线性累加的。它还可以模拟流域内土壤侵蚀的空间变化，这对于确定减少土壤侵蚀和沉积物负荷的管理方法很有用。建立了集总系统动态排沙模型，使排沙与简单的水文参数有关。两种模型都很好地模拟了实际数据。ANSWERS和集总系统水文模型的水文模拟结果与现场数据相当。 ANSWERS仿真结果对参数的变化很敏感。集总系统模型是非线性的，因为参数随风暴特征而变化。两种模型都适用于小流域。

著录项

  • 作者

    PARK, SEUNG WOO.;

  • 作者单位

    University of Illinois at Urbana-Champaign.;

  • 授予单位 University of Illinois at Urbana-Champaign.;
  • 学科 Geological Survey.Engineering Agricultural.
  • 学位 Ph.D.
  • 年度 1981
  • 页码 270 p.
  • 总页数 270
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号