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Inundation of anabranching river flood plain wetlands: the Ovens River, Victoria, Australia

机译:泛滥的河道泛滥平原湿地的泛滥:澳大利亚维多利亚州的烤箱河

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This study investigates flood plain inundation on the anabranching Ovens River, Australia, a regionally significant River Red Gum flood plain forest. Morphology and sedimentology was measured at sites with varying connectivity to the main river channel. Surface and groundwater levels, rainfall, evaporation and river height were monitored during 2009-2010. Rainfall was below average until August 2010, and then above average for the rest of 2010, with major flooding. During the initial period, rainfall supplied all flood plain water. Flood plain sedimentology determined whether water infiltrated, or formed lakes. Groundwater levels rose, eventually sustaining some oxbow lakes where conditions permitted groundwater exfiltration. Before groundwater sustained oxbow lakes at sites disconnected from the main channel, flow commenced in the anabranching channel network, and surface water inundated the oxbows. Overbank flow from the main channel only reached the flood plain during the major flood event. Our observations show that groundwater-surface water interactions are limited on these flood pjains, and only play a role at low to intermediate river stages, and quite modest flow stages can inundate significant portions of the flood plain provided anabranch connectivity is maintained.
机译:这项研究调查了澳大利亚支流的泛滥的奥文斯河(Ovens River)上的洪泛平原淹没,该地区是具有重要意义的河红胶洪泛平原森林。在与主要河道的连通性不同的地点测量了形态和沉积学。在2009-2010年期间,监测了地表水和地下水位,降雨量,蒸发量和河流高度。到2010年8月为止,降雨量一直低于平均水平,然后在2010年其他时间高于平均水平,主要洪水泛滥。在最初的时期,降雨供应了所有洪水平原水。洪水平原的沉积学决定了水是否渗透或形成了湖泊。地下水水位上升,最终维持了一些牛弓湖,条件允许地下水渗出。在与主要河道断开连接的地点,地下水持续存在牛b湖之前,在分支河网中开始流动,地表水淹没了牛bo。在主要洪水事件期间,来自主渠道的溢流仅到达洪水平原。我们的观察结果表明,在这些洪泛区中,地下水与地表水的相互作用受到限制,并且仅在中低阶河段中起作用,如果维持了分支的连通性,相当适度的水位会淹没泛洪平原的大部分。

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