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Drainage discharge impacts on hydrology and water quality of receiving streams in the wheatbelt of Western Australia

机译：排水排放对西澳大利亚州小麦带接收水文的水文和水质的影响

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摘要

The use of surface and subsurface drainage to manage waterlogging and salinity in dryland (rainfed) and irrigated agricultural systems is common throughout the world. The drainage systems often discharge into natural streams. The same is true for the wheatbelt drainage systems in south-western Australia, where 11,000 km (ABS 2003) of artificial drains have been constructed within the last two decades. Prior to this study, the likely impacts of this discharge on the streambed chemistry and water quality of receiving streams were largely unknown. The study evaluated these impacts in creeks receiving the drainage discharge from engineering options in four river systems in south-western Australia. This study clearly showed elevated levels of metals ions, EC and pH in the stream water at treated sites relative to their levels at untreated sites. At most sites, impacts of drainage discharge were observed on the streambed electrical conductivity (EC) and pH (both in 1:5 extract) in the receiving streams; however, there was little evidence of impact on metal ion content in the streambed soil. The study found no clear differences in the dynamics of the watertable adjacent to streams whether they received drainage discharge or not, irrespective of the size of the artificial drainage systems.
机译：在世界范围内，使用地表和地下排水来管理旱地（已灌溉）和灌溉农业系统中的涝渍和盐碱化现象很普遍。排水系统经常排入自然流。澳大利亚西南部的小麦带排水系统也是如此，在过去的二十年中，该地区已经建造了11,000公里（ABS 2003）的人工排水系统。在这项研究之前，这种排放对接收流的化学性质和水质的可能影响尚不清楚。该研究评估了在澳大利亚西南部的四个河流系统中，从小溪中接受工程选择排放的小溪的影响。这项研究清楚地表明，相对于未经处理的水位，处理过的水位中的水中金属离子，EC和pH的水平较高。在大多数地点，观察到排水对接收流中河床的电导率（EC）和pH（均为1：5提取物）的影响；然而，几乎没有证据表明对流化土壤中金属离子含量有影响。研究发现，不论人工排水系统的大小如何，无论是否接受排水，邻近河流的地下水位动力学都没有明显差异。

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