Time series of high-frequency sensor data measuring water temperature, dissolved oxygen, conductivity, specific conductance, total dissolved solids, chlorophyll a, phycocyanin, fluorescent dissolved organic matter, and turbidity at discrete depths in Beaverdam Reservoir, Virginia, USA in 2020-2021

We monitored water quality in Beaverdam Reservoir (Vinton, Virginia, USA) with high-frequency (10-minute) sensors in 2020-2021. Beaverdam Reservoir is owned and managed by the Western Virginia Water Authority as a secondary drinking water source for Roanoke, Virginia. This reservoir experiences substantial water level changes over the years due to its position at the headwaters of its catchment as well as management, and ranged from 10.2 to 12.48m (mean=11.31m, median=11.38m) during the monitoring period. Depth profiles of water temperature were measured by thermistors on ~1-meter intervals above the surface of the reservoir to 0.5 m above the sediments, complemented by dissolved oxygen and pressure sensors deployed at depth. These sensors (thermistor temperature, dissolved oxygen, and pressure) were held stationary as the water depth fluctuated from 10.2-12.48m. A YSI EXO2 sonde measuring temperature, conductivity, specific conductance, chlorophyll a, phycocyanin, total dissolved solids, dissolved oxygen, fluorescent dissolved organic matter, and turbidity was attached to a buoy that moved with the changing water level and thus was kept at a constant ~1.5 m depth. Dissolved oxygen was monitored at three different positions: 1.5 m from the EXO2, in the mid-water column at 2.37-4.65 m depth, and bottom waters at 9.70-11.92 m depth. All variables were measured at the deepest site of the reservoir adjacent to the dam.本研究于2020至2021年间，采用高频（10分钟间隔）传感器对美国弗吉尼亚州文顿市的比弗当水库（Beaverdam Reservoir）开展水质监测工作。该水库由弗吉尼亚西部水务局（Western Virginia Water Authority）所有并运营，作为弗吉尼亚州罗阿诺克市的二级饮用水源。该水库地处流域上游源头且受调度管理影响，多年来水位波动显著；监测期内水位介于10.2至12.48米之间（平均值11.31米，中位数11.38米）。研究人员以约1米的间距布设热敏电阻，从水库水面延伸至沉积物上方0.5米处，获取水温垂直剖面数据；同时在不同深度部署溶解氧传感器与压力传感器作为补充监测手段。上述三类传感器（水温热敏电阻、溶解氧传感器及压力传感器）的安装位置保持固定，可适配监测期内10.2至12.48米的水深波动。一台YSI EXO2多参数水质探头被安装于随水位同步升降的浮标上，该探头可恒定维持在约1.5米水深处，其监测参数涵盖水温、电导率、比电导率、叶绿素a、藻蓝蛋白、总溶解固体、溶解氧、荧光性溶解有机物及浊度。溶解氧监测设置于三个不同位置：距EXO2探头1.5米处、水深2.37至4.65米的水层中部，以及水深9.70至11.92米的底层水体。所有监测变量均在水库紧邻大坝的最深处测点完成采集。