PL-SWAT-51_20: a high-resolution simulated water balance and streamflow data set for 1951-2020 for the territory of Poland

The PL+ SWAT model hydrology dataset was derived for years 1951-2020 at sub-basin and reach level, with a daily time step. It includes model outputs for 4381 subbasins and river reaches covering the Poland territory and parts of the neighbouring countries from which water drains to Poland. At sub-basin level, the dataset contains average daily water balance components including precipitation total, snowfall, snowmelt, evapotranspiration (actual and potential), surface runoff, percolation, groundwater recharge, groundwater flow, tile flow and water yield (all components in mm/day) and soil water (mm) were included. At reach level it includes average daily streamflow values (m³/s).<br>The applied model was extensively calibrated and validated following a two-stage, multi-site calibration approach for 88 gauging stations across Poland for the period 2000-2019. The simulations showed satisfactory performance with a median Kling-Gupta efficiency of 0.73 and 0.69 in the calibration and validation period, respectively.

PL+ SWAT模型水文数据集的时间跨度为1951年至2020年，空间尺度覆盖子流域（sub-basin）与河段（reach）级别，时间步长为日尺度。该数据集包含覆盖波兰全境及周边汇入波兰径流区域的4381个子流域与河道河段的模型输出结果。在子流域尺度下，数据集涵盖日均水量平衡组分，包括总降水量、降雪量、融雪量、蒸散发（实际与潜在）、地表径流、渗透、地下水补给、地下水流动、暗管排水流（tile flow）、产水量（所有组分单位均为mm/day）以及土壤水含量（单位：mm）；在河段尺度下，数据集包含日均河道流量值（单位：m³/s）。<br>所采用的模型采用两阶段多站点率定方法，针对波兰境内88个水文站于2000年至2019年期间开展了全面率定与验证。模拟结果表现优异，率定期与验证期的Kling-Gupta效率（Kling-Gupta Efficiency）中位数分别为0.73与0.69。