کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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4685965 | 1635522 | 2010 | 9 صفحه PDF | دانلود رایگان |
Knowledge of erosion rates and sediment yields from gullies is critical for the effective prioritisation of management efforts aimed at reducing the impact of gully-derived sediments on water quality. This paper describes a rapid assessment method for estimating sidewall gully erosion rates for already established gully networks. It combines a conceptual-empirical model of the cycle of gully initiation and stabilisation with an easy-to-apply technique for assessing gully extent and dimensions. The method is illustrated using a case study of the Avon-Richardson Catchment of north-central Victoria, Australia. It is estimated that a total of 4.6 × 106 tonnes of sediment have been generated in that catchment from gully erosion since the latest major phase of gullying in the mid 1800s. This is equivalent to 8.9 t ha− 1 y− 1 if sediment generation was evenly distributed spatially and temporally across the 3300 km2 catchment over 160 years prior to 2010. Current rates of gully erosion are estimated to be 4700 t y− 1 (equivalent to 1.4 t ha− 1 y− 1). The results are comparable with observed rates of sidewall erosion in the Avon-Richardson Catchment. Further testing is required to build confidence in its applicability to assess sediment yields and for assisting regional authorities to plan remediation efforts.
Journal: Geomorphology - Volume 118, Issues 3–4, 1 June 2010, Pages 330–338