Study of Depth Area Duration Curves of Rainfall in Isfahan Province
2005
Chavoshi, Sattar | Yazdani, Mohammad Reza
Flood risk estimation is one of the most important subjects for Hydrologists. The main objective of flood risk estimation is study on past events in order to determine the following flood risk. There is various methods for flood risk estimation. Rainfall- runoff and emprical equations are the most recently used methods. In these methods, rainfall is the main parameter influencing flood mechanism. In this research, spatial distribution of rainfall pattern in Esfahan province is studied. Esfahan province with 10.5 million hectars area is located in central part of Iran with different topography, climate and ecological condition. A number of 203 rain guage, located in the study area and its around, were studied. The duration base of data record are 32 years, 1968-2000. A total of 1654 storm events with less than 1 hour to 72 hours duration were considered, in which three index event, I.e widespread and maximum events, were used. The common methods of Geostatistics, krigging, Co-krigging, IDW and TPSS, were applied to interpolate the recorded points to non-observed ones. Results show the low correlation between rainfall and height in the study area. Among the studied interpolating methods, krigging shows the best results, from which the Gussian and spherical models best fits to the observed points. In order to gain best results, it is recommended to add the number of rainfall guage sites according to the word meteorological organization (WMO) standards. Also, grouping the study area into homogeneous regions and studying DAD in each homogeneous region is advised.
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