GPS drifter data from near-field river plume in Doubtful Sound, New Zealand

here we provide gps drifter data from the near-field region, deep cove, in doubtful sound, new zealand. a controlled freshwater discharge is carried from alpine lakes (manapouri and te anau) through the manapouri hydroelectric power station and, via a constructed channel, into the head of doubtful sound, located on the southwest coast of new zealand (45.3 s, 167 e). the freshwater tailrace is discharged into the head of the inner fjord, deep cove. deep cove is 3.6 km long and, flanked by steep topography, has a maximum depth of 126m that occurs within 50m of the shoreline. a 2-week field campaign was conducted in march 2016.lagrangian measurements of near-surface currents were made during six gps drifter experiments. the plume discharge rate and wind speeds for each experiment are detailed below, and wind direction was consistently up-fjord due to the surrounding steep topography.the drifters each had a cylindrical drogue of height 0.5 m and diameter 0.2 m, and were ballasted to measure the upper 0.5 m of the water column by a small spherical float. wind slippage was minimal as the float had little exposure to wind above the surface water level. each drifter was equipped with a gps receiver (columbia v-900 gps data logger) which recorded every 1 second. the gps devices have a position accuracy up to 1.5 m, depending on satellite coverage. the drifters were released approximately 10 m apart across the width of the tailrace discharge point and were recovered after $\sim 1$ hour. a total of 8 drifters were deployed in the first two experiments then, due to the loss of a gps receiver, 7 drifters were deployed and retrieved in the subsequent four experiments

本数据集提供了新西兰多布特海峡近场区域深湾的GPS漂流浮标数据。该海峡位于新西兰西南海岸（45.3°S, 167°E），其源头为阿尔卑斯山脉中的湖泊（马纳波里湖和特阿瑙湖），湖水经马纳波里水电站后，通过人工渠道流入多布特海峡的头部。淡水尾流最终排放入内湾的深湾。深湾全长3.6公里，两侧地形陡峭，最大水深达126米，距离海岸线仅50米。2016年3月，进行了为期两周的野外调查。在六次GPS漂流浮标实验中，对近表层流进行了拉格朗日测量。以下是每个实验的排放通量速率和风速详情，由于周围地形陡峭，风向始终为向峡湾上游。每个漂流浮标配备了一个0.5米高、0.2米直径的圆柱形拖曳物，并通过一个小型球形浮标进行配重，以测量水柱上部的0.5米。由于浮标在水面上方暴露于风中的面积较小，风漂移效应微乎其微。每个漂流浮标装备了Columbia V-900 GPS数据记录仪，每秒记录一次数据。GPS设备的位置精度高达1.5米，取决于卫星覆盖情况。漂流浮标以大约10米间隔释放于尾流排放点的宽度方向上，并在约1小时后回收。在最初的两次实验中，共部署了8个漂流浮标，随后由于GPS接收器丢失，后续四次实验中仅部署和回收了7个漂流浮标。