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Geospatial Analysis of Mass-Wasting Susceptibility of Four Small Catchments in Mountainous Area of Miyun County, Beijing

机译:北京宫县山区四小集水区批量浪费易感性的地理空间分析

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摘要

Driven by the pull of gravity, mass-wasting comprises all of the sedimentary processes related to remobilization of sediments deposited on slopes, including creep, sliding, slumping, flow, and fall. It is vital to conduct mass-wasting susceptibility mapping, with the aim of providing decision makers with management advice. The current study presents two individual data mining methods—the frequency ratio (FR) and information value model (IVM) methods—to map mass-wasting susceptibility in four catchments in Miyun County, Beijing, China. To achieve this goal, nine influence factors and a mass-wasting inventory map were used and produced, respectively. In this study, 71 mass-wasting locations were investigated in the field. Of these hazard locations, 70% of them were randomly selected to build the model, and the remaining 30% of the hazard locations were used for validation. Finally, a receiver operating characteristic (ROC) curve was used to assess the mass-wasting susceptibility maps produced by the above-mentioned models. Results show that the FR had a higher concordance and spatial differentiation, with respective values of 0.902 (area under the success rate) and 0.883 (area under the prediction rate), while the IVM had lower values of 0.865 (area under the success rate) and 0.855 (area under the prediction rate). Both proposed methodologies are useful for general planning and evaluation purposes, and they are shown to be reasonable models. Slopes of 6−21° were the most common thresholds that controlled occurrence of mass-wasting. Farmland terraces were mainly composed of gravel, mud, and clay, which are more prone to mass-wasting. Mass-wasting susceptibility mapping is feasible and potentially highly valuable. It could provide useful information in support of environmental health policies.
机译:由重力牵引驱动,质量浪费包括所有与沉积在斜坡上的沉积物,包括蠕变,滑动的再活化的沉积工艺,塌落,流,和下降。至关重要的是要进行大量浪费敏感性分区,与决策者提供管理意见的目的。目前的研究提出了两个独立的数据挖掘方法,频率比(FR)和信息价值模型(IVM)方法,对在北京市密云县,中国的四种流域地图质量浪费易感性。为了实现这一目标,使用和生产,分别为9个影响因素和大规模消耗库存的地图。在这项研究中,71块,浪费地点在现场进行了调查。这些危险的地点,他们中的70%被随机选择来建立模型,和危险位置其余30%被用于验证。最后,接收器操作特性(ROC)曲线来评估质量浪费敏感性图由上述模型产生的。结果表明,该FR有较高的一致性和空间微分,以0.902(成功率下的面积)和0.883(预测速率下的面积)的各值,而IVM(成功率下的面积)具有0.865的较低值和0.855(预测速率下的面积)。这两个拟议方法是总体规划和评估目的有用的,他们证明是合理的模型。的6-21斜坡°是最常见的通过阈值,受控的质量浪费的发生。耕地梯田主要由砂砾,泥土和粘土,这是更容易出现大量浪费的。质量浪费易感性映射是可行的和潜在高度有价值的。它可以提供支持环境健康政策有用的信息。

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