Infrastructure Engineering - Theses
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ItemCatchment management for the control of sediment delivery: the case of the Eppalock Catchment, Victoria( 1996)This thesis investigates sediment delivery from large catchments, with regard to determining the benefits of whole-of-catchment management for controlling sediment delivery. This work was based on a case study from Victoria, and was supplemented by an analysis of data from other reservoir catchments in Victoria and around the world. The Lake Eppalock catchment, in central Victoria, was the case study considered in this investigation, and was examined in two steps. In the first pan of the analysis the original justification for the whole-of-catchment soil conservation project at Lake Eppalock, was investigated. In the second pan a field-based study of the catchment was implemented.. These analyses suggested that sediment delivered to Lake Eppalock was, and is, derived primarily from the channel network, and sediment delivery from the hillslopes is of minor significance. The investigation also indicated that the low hillslope yields may be attributed to the de-coupling of the hillslopes and drainage lines by broad footslopes. Examination of global sediment yield trends supported this hypothesis and thus a simple conceptual model was developed to explain variations in sediment delivery and long-term sediment yields between large catchments. The model was supported by thirteen of the sixteen case studies used in the validation process. On the basis of the conceptual model, it was concluded that whole-of-catchment management schemes may only be appropriate for controlling sediment delivery in steep catchments. In most flatter catchments, management techniques will have measurable impact in the channel areas only.