基于熵权法的田东县农业干旱识别与评价研究

干旱在我国是一种常见的自然现象,农业干旱灾害每年给国家和人民造成了严重的经济损失。为防患于未然和减轻干旱乏水的影响,不少国内外学者对干旱识别与评价开展了研究。本研究采用基于供需水量平衡的评价指标和用均值化方法处理得到的供需水相对指数作为熵权法的评价指标对农业干旱进行识别与评价,对属南亚热带季风气候区的田东县内不同农业区域的易旱区及干旱月、季度变化趋势、干旱程度进行识别与评价。分析计算的结果表明,熵权法用于识别与评价旱地农业干旱具有合理性,评价的结果与干旱实际情况较吻合,对干旱识别与评价是一种有效可行的方法。

Identification and evaluation of Tiandong county agricultural drought based on entropy weight method

Drought is a familiar natural phenomenon in China,and agricultural drought disaster has caused serious economic losses to the state and the people each year.To take preventive measures to reduce the impact of drought and water shortage,many scholars at home and abroad have committed to the identification and evalua-tion of agricultural drought research.In this study,index of water supply and demand balance,and relative index of water supply and demand based on average value method were used as entropy weight coefficient index to identify and evaluate the drought differences,drought’s month and quarter transformation trends and drought de-gree in different agricultural regions of Tiandong county,which is located in South Asia tropical monsoon climate zone.The analysis and calculation results show that the entropy weight method for identification and evaluation of agricultural drought in dry lands are reasonable,and the evaluation results are more consistent with the drought actual situation.It is an effective and feasible method.