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首页> 外文期刊>Geosciences >Examination of Sediment Dynamics Based on the Distribution of Silica Fluxes and Flood Sediments in the Otoishi River Related to the Northern Kyushu Heavy Rain Disaster, July 2017
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Examination of Sediment Dynamics Based on the Distribution of Silica Fluxes and Flood Sediments in the Otoishi River Related to the Northern Kyushu Heavy Rain Disaster, July 2017

机译：2017年7月，根据与九州北部暴雨灾害相关的大石江的硅通量和洪水沉积物分布调查沉积物动力学

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The heavy rain disaster occurred in July 2017, in northern Kyushu, Japan. The river environment greatly changed due to sediment moving accompanied by erosion. It is important regarding disaster prevention to localize watersheds where sediment transportation is active. In this study, the sediment dynamics were discussed on the basis of our investigation about the stored sediment, water-flow, and silica fluxes from sub-basins. As a result, the sediment survey revealed that many sediments consist of sand or gravel and were moved secondarily by water-flow. By the hydrological survey, it was confirmed that the trend of the dissolved silica concentrations varied between the right and the left bank tributaries. It was suggested that the left bank tributaries have a various process of water-flow. Considering the distribution of collapsed slopes, the right bank tributaries have more collapsed slopes than the left bank tributaries. As suggested by the results, the range of the silica flux is wider at the left bank tributaries because the sedimentation shows various distributions. On the other hand, the right bank tributaries were estimated topographically stable since the value of the silica flux is about the same.
机译：大雨灾害于2017年7月发生在日本九州北部。河流环境由于沉积物移动并伴有侵蚀而发生了很大变化。对于防灾而言，重要的是将沉积物运输活跃的流域局部化。在这项研究中，沉积物动力学是在我们对子盆地存储的沉积物，水流和二氧化硅通量进行调查的基础上进行讨论的。结果，沉积物调查显示许多沉积物由沙子或砾石组成，并且由于水流而被第二次运走。通过水文调查，证实了溶解的二氧化硅浓度的趋势在右岸支流和左岸支流之间变化。有人建议，左岸支流有各种水流过程。考虑倒塌坡的分布，右岸支流比左岸支流具有更多的倒塌坡度。结果表明，左岸支流的二氧化硅通量范围较宽，因为沉积物显示出各种分布。另一方面，由于二氧化硅通量的值大致相同，因此估计右岸支流在地形上是稳定的。

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