Relationship between Drought and Rainfall Due to Tropical Cyclone and Depression in Ninh Thuan, Vietnam
Pham Thi Phuong Thao *
Ho Chi Minh City Institute of Physics, Vietnam Academy of Science and Technology (VAST), 01 Mac Dinh Chi St., Ho Chi Minh City, Vietnam.
Phan Minh Thu
Institute of Oceanography, VAST, 01 Cau Da St., Nha Trang City, Vietnam and Graduate University of Science and Technology, VAST, 18 Hoang Quoc Viet, Ha Noi, Vietnam.
Nguyen Minh Giam
Southern Regional Hydrometeorological Center, National Hydro-Meteorological Service, 08 Mạc Dinh Chi St., Ho Chi Minh City, Vietnam.
Ho Dinh Duan
Graduate University of Science and Technology, VAST, 18 Hoang Quoc Viet, Ha Noi, Vietnam and Ho Chi Minh City Institute of Resources Geography, VAST, 01 Mac Dinh Chi St., Ho Chi Minh City, Vietnam.
Bui Hong Long
Institute of Oceanography, VAST, 01 Cau Da St., Nha Trang City, Vietnam and Graduate University of Science and Technology, VAST, 18 Hoang Quoc Viet, Ha Noi, Vietnam.
*Author to whom correspondence should be addressed.
Abstract
Tropical depressions/cyclones are natural phenomena which might impact negatively on human beings and the environment. Like other natural hazards, they sometimes can cause severe damage to the economy, infrastructure and community so that the benefits that come along with such hazards have almost been neglected. On the land, rainfall during and after the tropical cyclones has significantly decreased drought conditions in some semi-arid and arid areas. In the case of Ninh Thuan Province, tropical depression/cyclones could cause the flooding in the area where it is passed, but the weak tropical depression/cyclones can help to increase 0.5 - 12.39 times of monthly rainfall and contribute to total rainfall of 7 – 40% in dry season; and 0.4-2.18 times and 37 - 145% in wet season, respectively; or 3 – 39% of annual climatological rainfall. As the results, agriculture economic and local people can be taken a benefit from tropical depression/cyclones. Based on these results, the authorities can have some strategies to adapt and develop the local economy after such natural hazards.
Keywords: Tropical cyclone, tropical depression, rainfall, drought, SPI (standard precipitation index)