TY - GEN
T1 - A spatio-temporal drought analysis for the midwestern US
AU - Kao, Shih Chieh
AU - Govindaraju, Rao S.
AU - Niyogi, Dev
PY - 2009
Y1 - 2009
N2 - Droughts are prolonged abnormalities of moisture deficits that vary widely across temporal and spatial scales. Many hydrometeorologic variables are used to monitor the status of a drought. However, because of the dependence structure between all affecting variables under various temporal windows, an integrated spatio-temporal analysis of droughts cannot be easily achieved. In this study, a copula-based drought analysis was performed by using long-term monthly precipitation dataset for the upper Midwest United States. The spatio-temporal dependence relationships between various drought variables were investigated, and their joint probability distribution was constructed by combining drought marginals and the dependence structure. A copula-based joint deficit index (JDI) was adopted for an objective (probability-based) description of the overall drought status and compared to the Palmer drought severity index results. Results from the copula-based JDI provide information for drought identification, and further allow a month-by-month assessment for future drought recovery.
AB - Droughts are prolonged abnormalities of moisture deficits that vary widely across temporal and spatial scales. Many hydrometeorologic variables are used to monitor the status of a drought. However, because of the dependence structure between all affecting variables under various temporal windows, an integrated spatio-temporal analysis of droughts cannot be easily achieved. In this study, a copula-based drought analysis was performed by using long-term monthly precipitation dataset for the upper Midwest United States. The spatio-temporal dependence relationships between various drought variables were investigated, and their joint probability distribution was constructed by combining drought marginals and the dependence structure. A copula-based joint deficit index (JDI) was adopted for an objective (probability-based) description of the overall drought status and compared to the Palmer drought severity index results. Results from the copula-based JDI provide information for drought identification, and further allow a month-by-month assessment for future drought recovery.
KW - Copulas
KW - Drought
KW - Palmer drought severity index
KW - Standardized precipitation index
UR - http://www.scopus.com/inward/record.url?scp=70350146891&partnerID=8YFLogxK
U2 - 10.1061/41036(342)468
DO - 10.1061/41036(342)468
M3 - Conference contribution
AN - SCOPUS:70350146891
SN - 9780784410363
T3 - Proceedings of World Environmental and Water Resources Congress 2009 - World Environmental and Water Resources Congress 2009: Great Rivers
SP - 4654
EP - 4663
BT - Proceedings of World Environmental and Water Resources Congress 2009 - World Environmental and Water Resources Congress 2009
T2 - World Environmental and Water Resources Congress 2009: Great Rivers
Y2 - 17 May 2009 through 21 May 2009
ER -