Yang Wen-Jing, Li Jian-Zhu, Feng Ping
State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China.
Ying Yong Sheng Tai Xue Bao. 2022 Mar;33(3):801-807. doi: 10.13287/j.1001-9332.202202.019.
Drought is one of the main disasters causing agricultural production losses. Accurate and effective agricultural drought monitoring is of great significance to reduce agricultural production losses. In this study, the standardized soil moisture index for agricultural drought evaluation was established by using the historical time series of soil moisture. Based on the index, the temporal and spatial distribution of drought events in the Luanhe River Basin from 2002 to 2019 were analyzed, and the agricultural drought was quantitatively evaluated. The results showed that soil moisture of most grid units in the Luanhe River Basin obeyed normal distribution during the study period, and that the soil moisture of a few grid units obeyed generalized extreme distribution. The changes of drought and flood in each grid unit had good temporal consistency, that is, the changes of drought and flood was consistent. The changes of drought and flood in the middle of the basin was relatively significant, while the agricultural drought generally showed a trend of reduction. The spatial distribution of agricultural drought severity was not obvious. Relatively speaking, the drought characteristics (the frequency, duration and intensity of drought) were higher in the middle and northwest of the basin and lower in the southeast. The results could provide a reference for agricultural drought prediction and the formulation of drought prevention and mitigation measures in the Luanhe River Basin.
干旱是造成农业生产损失的主要灾害之一。准确有效的农业干旱监测对于减少农业生产损失具有重要意义。本研究利用土壤湿度历史时间序列建立了用于农业干旱评估的标准化土壤湿度指数。基于该指数，分析了2002—2019年滦河流域干旱事件的时空分布，并对农业干旱进行了定量评估。结果表明，研究期内滦河流域多数网格单元的土壤湿度服从正态分布，少数网格单元的土壤湿度服从广义极值分布。各网格单元旱涝变化具有良好的时间一致性，即旱涝变化趋势一致。流域中部旱涝变化相对显著，而农业干旱总体呈减轻趋势。农业干旱严重程度的空间分布不明显。相对而言，流域中部和西北部干旱特征（干旱频率、持续时间和强度）较高，东南部较低。研究结果可为滦河流域农业干旱预测及抗旱减灾措施的制定提供参考。
