Stream discharge in gaged watersheds at the Andrews Experimental Forest, 1949 to present

Streamflow from selected small watersheds has been continuously monitored at the Andrews Forest beginning in November 1952 and the Lookout Creek Gauging Station has been maintained by the USGS since October, 1949. The objectives of this study include: (1) to evaluate long-term changes in hydrology associated with various management treatments, notably clearcut logging, selective logging, and burning; (2) to provide baseline data for affiliated precipitation and stream water chemistry and sediment transport studies; and (3) to characterize the hydrologic regime of old-growth forests at different elevations. Streamflow records from small watersheds began in November 1952 at WS 1,2, and 3 (60 to 100 ha), 1963 at WS 6, 7, and 8 (15 to 22 ha) 1968 at WS 9 and 10 (9 and 10 ha), 1980 at Mack Creek (580 ha), and 1950 at Lookout Creek (2440 ha). Raw instantaneous streamflow data in cubic feet per second (cfs) and mean flow at fine temporal intervals are available. Rating curves for fixed trapezoidal flumes are maintained for all small watersheds except Lookout Creek and allow calculation of mean and total flow. The USGS-maintained Lookout Creek relies on annual rating table development to reflect changes in the open channel for instantaneous flow calculation. Entity 1 includes a reconstructed history of USGS Lookout Creek hourly data beginning in 1950 and more recently 30 and 15 minute interval data. Calculated mean cfs and total flow for each watershed are available at daily (Entity 2), monthly (Entity 3), annual (Entity 4), and stream sampling (Entity 6) time intervals. An interactive program, FLOW (Entity 5), allows the user to download instantaneous, mean and total flow at requested time periods (e.g., 15 minute, hourly) for all watersheds except for Lookout Creek.

自1952年11月起，研究人员便在安德鲁斯森林（Andrews Forest）对选定的小型流域径流开展持续监测；卢特特溪监测站（Lookout Creek Gauging Station）自1949年10月起由美国地质调查局（USGS）负责运维。本研究的目标包括：（1）评估与各类营林处理（尤其是皆伐、择伐及火烧）相关的水文长期变化；（2）为配套的降水、径流水化学及泥沙运移研究提供基准数据；（3）表征不同海拔老龄林的水文情势。小型流域径流监测记录的起始时间如下：WS 1、2、3（面积60~100公顷）始于1952年11月；WS 6、7、8（面积15~22公顷）始于1963年；WS 9与10（面积分别为9公顷与10公顷）始于1968年；麦克溪（Mack Creek，面积580公顷）始于1980年；卢特特溪（Lookout Creek，面积2440公顷）始于1950年。本数据集包含以立方英尺每秒（cfs）为单位的原始瞬时径流数据，以及高时间分辨率的平均流量数据。除卢特特溪外，所有小型流域均配备固定梯形渡槽率定曲线，可用于计算平均流量与总流量。由美国地质调查局运维的卢特特溪监测站则通过编制年度率定表来反映明渠变化，以支撑瞬时流量计算。实体1（Entity 1）包含1950年起重构的美国地质调查局卢特特溪逐小时数据序列，以及近期的30分钟、15分钟间隔数据。各流域的计算平均流量（以cfs为单位）与总流量数据，可按日（实体2/Entity 2）、月（实体3/Entity 3）、年（实体4/Entity 4）及溪流采样（实体6/Entity 6）的时间粒度获取。交互式程序FLOW（实体5/Entity 5）支持用户按需下载除卢特特溪外所有流域的瞬时流量、平均流量及总流量数据，可指定的时间粒度包括15分钟、逐小时等。