水文干旱是指河川径流低于其正常值或含水层水位降低的现象，其主要特征是在特定面积、特定时段内可利用水量的短缺。
最后，还补充阐述了水文干旱、降水资源化利用的意义。
At last, the significance of hydrological drought and treatment of precipitation as a resource were expounded additionally.
通过水文干旱识别和枯水期径流量预估，建立了供水系统水文干旱的预测模型。
Based on the recognition of hydrological drought and the runoff forecasting during the drought period, a forecasting model of hydrological drought is established.
水资源的开发利用、水土保持以及土地利用等人类活动使得西北地区水文干旱进一步加剧。
Human activities, including the utilization of water resources, the water and soil conservation, and land use, all contribute to the hydrologic drought of northwest China.
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