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Real Time WWW Broadcasting of Soil Moisture Index for Drought Response

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  2007 ASAE Annual Meeting  072024.(doi:10.13031/2013.23091)
Authors:   Won Ho Nam, Jin Yong Choi, Min Won Jang, Seung Hwan Yoo, , , Bernard A Engel
Keywords:   World Wide Web, Geographic Information Systems, Web-GIS, Drought Index, Soil Moisture Index (SMI)

Damage from agricultural droughts would not be underestimated comparing other natural hazard like floods. Because the impacts of drought spread gradually on wide areas over a long period, it is important to understand drought development. As the agricultural drought is under the influences of several factors such as rainfall, soil characteristics and crops, an analysis method that is based on SMI (Soil Moisture Index) used to measure a drought condition was suggested. Effective drought management can be achieved through the drought monitoring based on the ability of assessing current conditions and predicting future drought development. Soil moisture deficiency resulted from rainfall shortage has a relation to the agricultural drought, especially for crops and vegetations so that the drought can be evaluated using soil moisture conditions. In this study, a system that can broadcast drought condition in real time through the internet for drought response was developed using a Web-based GIS (Geographic Information System). Through this system, users can access WWW graphical user interface and analyze a drought status, intensity, duration and spatial extent along with drought impacts. In addition, users can obtain a daily soil moisture index map at the level of mid-range of hydrologic unit watershed scale in Korea and evaluate the agricultural drought severity from soil moisture changes. The system can be used to provide current drought conditions and the comprehensive data of drought evaluation for supporting decision makers.

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