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Monitoring river channel dynamics using remote sensing and GIS techniques

机译：使用遥感和GIS技术监控河道动态

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River channel dynamics are natural autogenic occurrences for fluvial rivers with influences from human modifications and climatic factors. Remote sensing and geographic information system tools and techniques, aerial photographs, and satellite imagery have been used to determine epochal channel erosion, accretion, and unchanged locations along Tana River, Kenya's longest river. Six reaches within a 142-km Saka-Mnazini stretch were studied by comparing sequential changes in the position of the channel in 1975-1986, 1986-2000, 2000-2017, and 1975-2017 epochs. Manual and automatic digital processing procedures and GIS tools were applied to visualize and quantify the reach-wise spatial and temporal morphological changes. The erosion and accretion channel changes over the study period were observed and quantified at all reaches. Meandering and switching off or abandoning the main active channel was also illustrated. The potential driving forces of morphological changes included varying hydrological regime, upstream land use practices, nature of channel gradient, and riparian vegetation occurrence changes. We found no clear evidence to link river regulation with the river channel dynamics. Results deliver the latest evidence on the dynamics of Tana River. This information is crucial for understanding river evolution characteristics and aid in planning and management at the lower reaches which has remained poorly understood. Use of remote sensing data in concert with GIS provides efficient and economical quantitative spatial and temporal analysis of river channel changes. (C) 2018 Elsevier B.V. All rights reserved.
机译：河道动力学是河流河流的自然自生事件，受人类影响和气候因素的影响。遥感和地理信息系统的工具和技术，航空照片和卫星图像已被用于确定沿肯尼亚最长河塔纳河的划时代的河道侵蚀，增生和未改变的位置。通过比较1975-1986年，1986-2000年，2000-2017年和1975-2017年时期通道位置的连续变化，研究了142公里Saka-Mnazini伸展带中的六个河段。应用了手动和自动数字处理程序以及GIS工具来可视化和量化到达方向的空间和时间形态变化。在整个研究期间，对侵蚀和增生渠道的变化进行了观察，并在所有河段进行了量化。还说明了蜿蜒和关闭或放弃主活动通道。形态变化的潜在驱动力包括变化的水文状况，上游土地利用实践，河道梯度的性质以及河岸植被的发生变化。我们没有找到明确的证据将河道整治与河道动力学联系起来。结果提供了有关塔那河动力学的最新证据。这些信息对于理解河流的演变特征以及帮助对仍然知之甚少的下游进行规划和管理至关重要。与GIS配合使用遥感数据可对河道变化进行高效，经济的定量时空分析。 （C）2018 Elsevier B.V.保留所有权利。

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