ABSTRACT River banks are an important transition zone between aquatic and terrestrial environments. This ecotone is highly vulnerable to natural and anthropogenic disturbances. Bank erosion is a common occurrence along the River Murray. Morphological features reflecting river bank instability form a near-continuous pattern along large tracts of the river. This study investigates the character and extent of bank instability along the Torrumbarry Weir Pool. Over 90% of the bank length in this weir pool was assessed as being actively eroding. Notch development was the dominant instability mechanism and it promoted other forms of bank instability. Erosion notches result from stable water levels and inherent soil instability of the river banks along the weir pool. The character and extent of river bank erosion recorded along this section of the River Murray is an artefact of flow regulation and not a reflection of the natural occurrence of bank erosion in river networks. Water level management in the upstream weir pool has significant implications for the management of river banks along regulated reaches of the River Murray.

中文翻译：

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墨累河堰坝沿岸的河岸不稳定

摘要 河岸是水生环境与陆地环境之间的重要过渡带。该交错带极易受到自然和人为干扰的影响。河岸侵蚀是墨累河沿岸常见的现象。反映河岸不稳定性的形态特征沿着大片河流形成了近乎连续的模式。本研究调查了 Torrumbarry 堰池沿岸堤岸不稳定的特征和程度。该堰池中超过 90% 的堤岸长度被评估为正在侵蚀。Notch 发展是主要的不稳定机制，它促进了其他形式的银行不稳定。侵蚀槽口是由稳定的水位和沿堰池的河岸固有的土壤不稳定性造成的。沿墨累河的这一部分记录的河岸侵蚀的特征和范围是流量调节的产物，而不是河网中河岸侵蚀的自然发生的反映。上游堰池的水位管理对墨累河受管制河段的河岸管理具有重要意义。