Temporal variations of reservoir sediment sources in a small mountainous catchment in Korea
Temporal variations of reservoir sediment sources in a small mountainous catchment in Korea
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DOI：
10.1002/esp.3379
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发表时间：
2013-09
影响因子：
3.3
通讯作者：
Jin Kwan Kim;Y. Onda;D. Yang;M. Kim
中科院分区：
文献类型：
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作者：
Jin Kwan Kim;Y. Onda;D. Yang;M. Kim
了解水库沉积的时间变化和确定沉积物的主要来源是维持可持续水库的必要条件。为此，2005年7月至2007年11月对水库沉积物进行了实地测量、采样和指纹识别。采用铯- 137 （137Cs）对水库沉积物进行了源指纹图谱。采用混合模型计算了沟岸、林道和林底物质对水库泥沙的相对贡献。据估计，河岸和林道物质约占水库沉积物的96%，是主要来源。在一次80年一遇的暴雨期间，库区发生了巨大的淤积，约占观测期内库区总淤积的60%。因此，为了在本研究中保持水库的可持续性，应考虑对暴雨和河岸和森林道路侵蚀的时空准备策略。然而，137Cs指纹图谱提供的沉积物来源空间信息有限。为了更好地识别沉积物的时空来源，需要进一步应用土壤侵蚀模型进行研究，并进行更详细的野外研究。版权所有©2013 John Wiley & Sons， Ltd
An understanding of the temporal variation in reservoir sedimentation and identification of the main sources of sediment are necessary for the maintenance of sustainable reservoirs. For this purpose, field measurements, sampling, and fingerprinting of reservoir sediment were undertaken from July 2005 to November 2007. Source fingerprinting of reservoir sediment was conducted using cesium‐137 (137Cs). The relative contributions of gully bank and forest road, and forest floor material to reservoir sediment were calculated using a mixing model. Bank and forest road material, estimated to make up about 96% of the reservoir sediment, was the dominant source. Enormous reservoir sedimentation, which amounted to about 60% of the total reservoir sedimentation during the observation period, occurred during a heavy rainstorm with an 80‐year recurrence time. To maintain the sustainability of the reservoir in this study, therefore, temporal and spatial preparation strategies for heavy rainstorms and bank and forest road erosion should be considered. However, spatial information on sediment sources from 137Cs fingerprinting is limited. To better identify the sediment sources spatially and temporally, further studies applying soil erosion models and more detailed field studies are needed. Copyright © 2013 John Wiley & Sons, Ltd.