MH21 - High Flow Volume

IHA metric - Mean of the high flow volume (calculated as the area between the hydrograph and the upper threshold during the high flow event) divided by median annual daily flow across all years. The upper threshold is defined as 1 times median annual flow. Measured in days. Covering 64 years (1950-2013) for German stream network (1km grid cells)IHA指标（Indicators of Hydrologic Alteration）指高流量体积均值，其计算方式为高流量事件期间水文过程线与上限阈值之间的围合面积除以所有年份的年日均流量中位数。其中上限阈值被定义为1倍年流量中位数，该指标的计量单位为天。本数据集涵盖德国河网（1km栅格单元）1950年至2013年共计64年的观测数据。