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首页> 外文期刊>Natural Hazards >Quantitative technique for assessing the geomorphic thresholds for floodplain instability and braiding in the semi-arid environment. (Special Issue: Modelling of river hazards.)
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Quantitative technique for assessing the geomorphic thresholds for floodplain instability and braiding in the semi-arid environment. (Special Issue: Modelling of river hazards.)

机译：用于评估半干旱环境中洪泛区不稳定性和编织的地貌阈值的定量技术。 （特刊：河流灾害的建模。）

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摘要

For the semi-arid environment of southern California, a reach-scale classification system and conceptual model were created to synthesize the observed floodplain forms into three basic floodplain continuums: armored, non-armored, and active-regional alluvial fan. These continuums are comprised of three to five alluvial floodplain forms (cascade, step-pool, plane-coarse-bed, plane-mixed-bed, plane-fine-bed, pool-riffle, braided, and dune-ripple). For the non-armored floodplain continuum, a floodplain state diagram has been generated to quantitatively describe the natural downstream progression of floodplain forms and geometry, using specific stream power and the width-to-depth ratio as the state and shape metrics, respectively. Based on field data for 91 cross sections along 14 watercourses, this floodplain state diagram provided the basis to define geomorphic thresholds for floodplain instability and braiding using logistic regression analyses. This method for defining floodplain instability thresholds provides a unique management tool by providing both a systematic and a quantitative means to assess the stability state of watercourses and, thereby, provide a means for assessing the potential for the hazards associated with watercourse instability.Digital Object Identifier http://dx.doi.org/10.1007/s11069-010-9553-2
机译：对于南加州的半干旱环境，创建了一个范围尺度分类系统和概念模型，以将观测到的洪泛区形式合成为三个基本洪泛区连续体：装甲，非装甲和活动区域冲积扇。这些连续体由三到五个冲积洪泛平原形式（梯级，阶梯池，平面粗床，平面混合床，平面细床，池浅滩，辫状和沙丘波纹状）组成。对于无铠装的洪泛区连续体，已生成洪泛区状态图，以定量方式描述洪泛区形式和几何形状的自然下游进程，分别使用特定的水流功率和宽深比作为状态和形状度量。基于沿14个水道的91个断面的现场数据，该洪泛区状态图提供了使用logistic回归分析定义洪泛区不稳定性和编织的地貌阈值的基础。这种定义洪泛区不稳定阈值的方法通过提供系统和定量的手段来评估河道的稳定状态，从而提供了一种独特的管理工具，从而提供了一种评估与河道不稳定有关的潜在危害的手段。 http://dx.doi.org/10.1007/s11069-010-9553-2

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