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首页> 外文期刊>Water >Diel and Seasonal Patterns in Continuously Monitored Water Quality at Fixed Sites in Two Adjacent Embayments of the Tidal Freshwater Potomac River
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Diel and Seasonal Patterns in Continuously Monitored Water Quality at Fixed Sites in Two Adjacent Embayments of the Tidal Freshwater Potomac River

机译：潮汐淡水波托马克河两个相邻路段固定地点连续监测水质的狄尔和季节模式

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Water quality patterns in two adjacent embayments of the tidal freshwater Potomac River were compared using continuously monitored data. The two embayments, the tidal Occoquan and Gunston Cove, are shallow embayments fed by tributaries which vary in their watershed attributes. The tidal Occoquan has a larger watershed and a dam just upstream from the head of tide whereas Gunston Cove has a large wastewater treatment plant just upstream of the embayment. Water temperature, specific conductance, dissolved oxygen (DO), and pH were collected at 15 min intervals at representative locations in the two embayments from April through November of 2012. Mean daily values of water quality variables exhibited similar seasonal patterns at both sites which were related to seasonal patterns of forcing functions such as temperature, light and freshwater inflows. Three two-week intervals were examined in great detail. During a mid-summer period of stable conditions and low flow, both embayments exhibited strong and consistent diel (light cycle-based) periodicity in temperature, DO, and pH. Specific conductance exhibited semi-diel (tidal cycle-based) periodicity. The two other two-week intervals were punctuated by substantial flow events which resulted in major changes in daily mean values and disruptions to the typical diel or semi-diel cycles. The large rainfall event related to Hurricane Sandy caused a major disruption in diel and semi-diel cycles. Some cycles were quickly re-established and others took a week or more. The two embayments exhibited similar behavior in most aspects. Site-specific factors such as differences in the frequency and magnitude of tributary flow pulses and the presence of treated sewage discharge at Gunston Cove helped explain some of the differences observed between the two embayments.
机译：使用连续监测的数据比较了潮汐淡水波托马克河的两个相邻河口的水质模式。潮汐Occoquan和Gunston Cove这两个河道是由支流提供的浅层河道，支流的分水岭属性各不相同。潮汐Occoquan在潮汐头上游处有一个较大的分水岭和一个水坝，而Gunston Cove在河口上游处有一个大型废水处理厂。从2012年4月至2012年11月，在两个小隔间的代表性地点每隔15分钟收集一次水温，电导率，溶解氧（DO）和pH值。两个地点的水质变量日均值在两个地点均表现出相似的季节性模式与强迫功能的季节性模式有关，例如温度，光照和淡水的流入。详细检查了三个两周的间隔。在稳定条件和低流量的仲夏时期，这两个巢穴在温度，溶解氧和pH值上都表现出强而一致的diel（基于光循环）周期性。比电导表现出半迪尔（基于潮汐周期）的周期性。另外两个两周的时间间隔被大量流量事件打断，导致每日平均值发生重大变化，并破坏了典型的迪尔或半迪尔周期。与飓风桑迪有关的大降雨事件导致了迪尔和半迪尔周期的重大破坏。一些周期很快被重新建立，而其他周期则花费了一周或更长时间。这两个掩体在大多数方面表现出相似的行为。特定地点的因素，例如支流流量的频率和大小的差异以及Gunston Cove处污水处理后的排放的存在，有助于解释这两个通道之间观察到的某些差异。

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