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首页> 外文期刊>Lakes & Reservoirs >Turbid flow through a tropical reservoir (Lake Dalrymple, Queensland, Australia): Responses to a summer storm event
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Turbid flow through a tropical reservoir (Lake Dalrymple, Queensland, Australia): Responses to a summer storm event

机译：流经热带水库（澳大利亚昆士兰州达勒姆普尔湖）的浑浊水：对夏季风暴事件的响应

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The first flood event following a prolonged dry period is described for an impoundment, Lake Dalrymple, in tropical north-eastern Australia. The event, in January 1996, generated substantial flow in the two main inflow sources: the Burdekin River from the north and the Suttor River from the south. Flow through the Burdekin River peaked early and then subsided to a lower level, but flow through the Suttor River persisted at a moderate level for over 15 days after the initial inflow. An extensive water quality survey was conducted on 16 January 1996 (seven days after the initial dam overflow) to determine the nature of the inflows originating from the two major subcatchments feeding the reservoir as they entered and passed through the impoundment. The inflow comprising waters of high turbidity and low conductivity occupied the mid-column region along the two major inflow channels through the impoundment to the dam wall. The suspended particulate material in the form of silt and clay sized particles remained in suspension as the flow passed through the reservoir, due in part to the low ionic strength of the inflow and the relative densities of the inflowing and receiving waters. For both river sources, more than 50% of the total nitrogen and almost all of the total phosphorus were bound to the suspended particulate matter. Much of this was exported in the flow over the spillway. The highly turbid nature of the inflow resulted in strong attenuation of down-welling photosynthetically active radiation (up to maximum attenuation values of 12.24 m–1 in the reservoir where the euphotic depth was only 0.38 m). The irradiance reflectance and the scattering coefficient were considerably higher than any reported for other Australian inland waters. Concentrations of viable chlorophyll a in the surface waters were very low (maximum value 3.4 Μg L–1) because of the highly turbid conditions and extensive dilution by the inflow. The results of this study provide an example of the significant impact a large inflow of turbid, low conductance water can have on a large reservoir in the arid tropics following a prolonged dry period. During inflow events such as the one described in this paper, the reservoir becomes riverine in nature, and large amounts of suspended particulate matter and associated nutrients are transported through the reservoir.
机译：在澳大利亚东北部热带地区，Dalrymple湖的蓄水层描述了长时间干旱后的首次洪水事件。该事件于1996年1月发生，在两个主要的流入源中产生了大量流量：北部的Burdekin河和南部的Suttor河。穿过布尔德金河的流量先达到峰值，然后下降到较低的水平，但经过萨特河的流量在最初流入后持续了15天以上。 1996年1月16日（大坝初次溢出后的7天）进行了广泛的水质调查，以确定流入两个主要子汇水区的水流的性质，这两个主要子汇水流进入水库并通过蓄水库。包含高浊度和低电导率水的入水沿两个主要入水通道（穿过蓄水库到达坝壁）占据了中柱区域。淤泥和粘土大小的颗粒形式的悬浮颗粒材料在流过储层时仍保持悬浮状态，部分原因是流入水的离子强度低以及流入水和接收水的相对密度。对于这两个河源，总氮的50％以上和磷的几乎全部都与悬浮颗粒物结合。其中大部分出口到溢洪道的水流中。流入的高度浑浊性质导致向下流动的光合有效辐射的强烈衰减（在富营养度深度仅为0.38 m的储层中，衰减最大值达到12.24 m–1）。辐照度反射率和散射系数大大高于其他澳大利亚内陆水域的报告值。由于高度混浊的条件和流入水的大量稀释，地表水中活的叶绿素a的浓度非常低（最大值3.4 Mg L-1）。这项研究的结果提供了一个例子，说明长期干旱后，大量的浑浊，低电导率的水可能对干旱热带地区的大型水库产生重大影响。在诸如本文所述的入流事件期间，储层本质上成为河流，大量悬浮颗粒物和相关养分通过储层运输。

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