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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Reach-scale bankfull channel types can exist independently of catchment hydrology
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Reach-scale bankfull channel types can exist independently of catchment hydrology

机译：到达范围的银行频道类型可以独立于集水流程而存在

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摘要

Reach-scale morphological channel classifications are underpinned by the theory that each channel type is related to an assemblage of reach- and catchment-scale hydrologic, topographic, and sediment supply drivers. However, the relative importance of each driver on reach morphology is unclear, as is the possibility that different driver assemblages yield the same reach morphology. Reach-scale classifications have never needed to be predicated on hydrology, yet hydrology controls discharge and thus sediment transport capacity. The scientific question is: do two or more regions with quantifiable differences in hydrologic setting end up with different reach-scale channel types, or do channel types transcend hydrologic setting because hydrologic setting is not a dominant control at the reach scale? This study answered this question by isolating hydrologic metrics as potential dominant controls of channel type. Three steps were applied in a large test basin with diverse hydrologic settings (Sacramento River, California) to: (1) create a reach-scale channel classification based on local site surveys, (2) categorize sites by flood magnitude, dimensionless flood magnitude, and annual hydrologic regime type, and (3) statistically analyze two hydrogeomorphic linkages. Statistical tests assessed the spatial distribution of channel types and the dependence of channel type morphological attributes by hydrologic setting. Results yielded 10 channel types. Nearly all types existed across all hydrologic settings, which is perhaps a surprising development for hydrogeomorphology. Downstream hydraulic geometry relationships were statistically significant. In addition, cobble-dominated uniform streams showed a consistent inverse relationship between slope and dimensionless flood magnitude, an indication of dynamic equilibrium between transport capacity and sediment supply. However, most morphological attributes showed no sorting by hydrologic setting. This study suggests that median hydraulic geometry relations persist across basins and within channel types, but hydrologic influence on geomorphic variability is likely due to local influences rather than catchment-scale drivers. (c) 2020 John Wiley & Sons, Ltd.
机译：到达范围的形态信道分类是由每个渠道类型与克利特和集水区水文，地形和泥沙供应司机的组装有关的理论受到的理论。然而，每个驱动器对达到形态的相对重要性尚不清楚，不同的驾驶员组合产生相同的达到形态。到达尺度分类从未需要在水文中取得追求，但水文控制放电并因此进行沉积物输送能力。科学问题是：使用不同的达尺度通道类型的水文凝视的可量化差异进行两种或更多个区域，或者进行通道类型超越水文环境，因为水文设置不是达到达尺寸的主导控制？本研究通过将水文指标隔离为通道类型的潜在主导控制来回答了这个问题。使用不同的水文环境（Caramento River，California）的大型测试盆中应用了三个步骤：（1）基于本地站点调查，（2）通过洪水幅度，无量纲洪水幅度进行分类，和年度水文制度类型，（3）统计分析两种水中键。统计学测试评估了通道类型的空间分布和渠道型形态属性的依赖性通过水文环境。结果产生了10种通道类型。几乎所有类型的水文环境都存在，这可能对水文晶体的令人惊讶的发展。下游液压几何关系是统计学意义。此外，鹅卵石主导的均匀流呈斜坡和无量纲洪水幅度之间的一致反相关系，是传输能力与沉积物之间的动态平衡的指示。然而，大多数形态学属性没有通过水文凝视进行分类。本研究表明，液压几何关系跨越盆地和渠道类型内的中​​位数，但对地貌变异性的水文影响可能是由于局部影响而不是集水区的司机。 （c）2020 John Wiley＆Sons，Ltd。

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