ABSTRACT The shores of the Bratsk reservoir are widely affected by bank gullies. We monitored the short- and medium-term gully dynamics at three key sites. The interaction of karst-erosional, aeolian-erosional, and gully and shore erosion processes were determined and presented as conceptual models. Gully and shore erosion were the dominating processes in the Rassvet site in the period of heavy rainfall and the maximum shore edge retreat at high water level stand (2009–2010). During 2011–2013 aeolian process prevailed over erosion due to small rainfall and low water-level stand, and aeolian material accumulated in the gullies. A high water-level period at the Ulei site resulted in shore edge retreat, hanging of gully mouths, formation of wave-cut holes in the shore scarp, and rejuvenation of retrogressive erosion in gully thalwegs. The combined action of karst and gully erosion processes led to a maximum increment in gully size (4486.34 m3), recorded at the Khadakhan site in 2004–2008 (at periods of reservoir water-level lowering following water saturation of shore massif at high water levels). This case study shows that the dynamics of the processes, their interactions, and environmental changes are characterized by a certain cyclicity corresponding to water-level changes.

中文翻译：

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大坝水库岸边沟壑发育：动力学、相互作用和机制

摘要 Bratsk 水库的岸边受到岸沟的广泛影响。我们监测了三个关键地点的短期和中期沟壑动态。岩溶-侵蚀、风成-侵蚀、沟壑和海岸侵蚀过程的相互作用被确定并作为概念模型呈现。沟壑和海岸侵蚀是 Rassvet 站点在强降雨期间的主要过程，并且在高水位时（2009-2010 年）海岸边缘后退最大。2011-2013年间，由于降雨量少、水位低，风积物质在沟壑中堆积，风积过程战胜了侵蚀。Ulei 遗址高水位时期导致岸边退缩，沟口悬空，岸陡坡形成波浪形洞，沟壑退蚀再生。2004-2008 年在 Khadakhan 站点记录的岩溶和沟蚀过程的共同作用导致沟壑大小的最大增量（4486.34 m3）（在高水位的岸地块水饱和后水库水位降低的时期） ）。本案例研究表明，这些过程的动力学、它们的相互作用和环境变化具有与水位变化相对应的特定周期性。