Evaluation of Utilization Satellite-based Drought Indicesin the Korean Peninsula |
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학술지명 2019 Busan Water Forum
저자 김영호,채효석,황의호,박광하,김대선
발표일 2019-09-18
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Globally, the frequency of floods and droughts due to rapid climate change is increasing. In particular, in the case of drought, unlike other natural disasters, the pace of progress is slow and it is difficult to determine the beginning and end clearly in time and space. Moreover, the impact of drought damage is long term and the damage is complicated in social, economic, and environmental aspect, making it difficult to grasp the magnitude of damage. In general, the definition of drought is divided into meteorological drought, hydrologic drought, and agricultural drought depending on purpose and type. In addition, various drought indices have been developed around the world according to their purpose and interest, and studies have been conducted to quantify the degree of drought. In this study, the satellite based meteorological drought index SPI (Standardized Precipitation Index), EDI (Effective Drought Index), hydrologic drought Index, WBDI (Water Budget based drought Index), EWDI (Energy based Water Deficit Index), agricultural drought index VHI (Vegetation Health Index), ADCI (Agricultural Dry Condition Index) for the Korean Peninsula were mutually compared and analysed to confirm the availability of the data. These drought Indices were calculated using precipitation data from TRMM (Tropical Rainfall Measuring Mission) and GPM (Global Precipitation Measurement) Mission, and LST (Land Surface Temperature), NDVI (Normalized Difference Vegetation Index), VCI (Vegetation Condition Index), TCI (Temperature Condition Index), ESI (Evaporative Stress Index) and SMSI (Soil Moisture Saturation Index) from MODIS (Moderate Resolution Imaging Spectroradiometer). Monthly drought index was used to classify by land cover and identify the drought index suitable for each land use. In addition, for the equality evaluation of the drought index by type, correlation analysis between the indices was conducted, and the relationship with the vegetation was compared with MODIS GPP (Gross Primary Production). It is believed the implementation of a visualization system will enhance usability to provide users with an intuitive way to provide each drought index. In the future, it will be useful to cope with drought if it is possible to analyse patterns in a wide range of regions and monitor and forecast regional drought along with images of water resource specialized satellite. |