Abstract

Drought is one of the costliest natural disasters, effecting many aspects of human livelihoods. This study assessed drought conditions in Cambodia from Moderate Resolution Imaging Spectroradiometer (MODIS) data during 2000 to 2019 using the Vegetation Health Index. The results verified with the satellite soil moisture indicated close agreement between these two datasets. The drought areas were concentrated in the country’s central plains, with the larger drought area particularly observed for 2016. Roughly 31.3% of rice-growing area was affected by severe drought during the dry season in this abnormal year (2016), compared to that of 26.1% in a normal year (2017). The results of drought probability calculated for the entire study period indicated that 63 and 17 districts were associated with droughts in the dry and wet seasons, respectively. This study demonstrated the potential application of MODIS data for decadal drought assessment over rice cultivated areas, which was important for crop and water management.

摘要

干旱是代价最高的自然灾害之一，影响人类生计的许多方面。本研究利用植被健康指数从 2000 年至 2019 年期间的中分辨率成像光谱仪 (MODIS) 数据评估了柬埔寨的干旱状况。用卫星土壤湿度验证的结果表明这两个数据集之间的一致性很高。旱区集中在中原地区，2016年的旱区尤为明显。在这个异常年份（2016年）旱季，约31.3%的水稻种植面积受到严重干旱的影响，相比之下，正常年份（2017 年）为 26.1%。整个研究期间的干旱概率计算结果表明，旱季和雨季分别有 63 个和 17 个地区与干旱有关。