During the period of observation, the percent of meteorological drought area in Hanoi city increased from the 1980s (13%). The highest drought area of 54% total areas was affected by drought in the hydrological year of 1992-1993, when the area experienced its most severe drought both in terms of area and severity. | BÀI BÁO KHOA HỌC CHARACTERIZING TEMPORAL AND SPATIAL VARIABILITY OF METEOROLOGICAL DROUGHT IN HANOI CITY, VIETNAM Tran Dang An1, Trieu Anh Ngoc1, Nguyen Van Hai1, Do Van Quang2 Abstract: For the last decades, Hanoi city (HN), Vientam has suffered a series of super extreme meteorological droughts and resulting in tremendous socio-economic losses. This study analyzed the temporal and spatial variations of meteorological drought in HN from 1980 to 2014. Based on the standardized precipitation index (SPI) that was calculated from 24 precipitation monitoring stations, three time scales (month, year and decade) for the meteorological drought frequency (DF) and meteorological drought area were applied to estimate the spatio-temporal structure of meteorological droughts by employing ArcGis . A time-series analysis showed that winter droughts and spring droughts occurred frequently for almost half of the year from November to May. Summer droughts occasionally occurred in severe drought decades: the 1980s, 1990s and 2000s. During the period of observation, the percent of meteorological drought area in Hanoi city increased from the 1980s (13%). The highest drought area of 54% total areas was affected by drought in the hydrological year of 1992-1993, when the area experienced its most severe drought both in terms of area and severity. Key words: Drought characteristics, Meteorological drought, Hanoi City Avoiding meteorological drought is 1. INTRODUCTION 1 Drought is one of the most severe and least impossible as it is driven by many understood of all natural hazards, affecting on complicated factors and occurs very slowly billions of people and ecosystems annually and hardly to identify. However, assessing around the world. It can affect large areas and and monitoring meteorological droughts are may have serious environmental, social and normally performed based on drought economic .
