Watershed

Oral

392990 - UNCERTAINTY IN DROUGHT REPORTING ACROSS DIFFERENT SPATIAL SCALES

Tuesday, June 5
4:00 PM - 5:30 PM
Location: Greenway IJ
Co-Authors: G Padmanabhan, Fargo, ND – North Dakota State University; Peter Oduor, Fargo, ND – North Dakota State University; Adnan Akyüz, Fargo, ND – North Dakota State University

This study demonstrated how geospatial analysis tools can be effectively used to improve the drought monitoring and management. Understanding spatial variation of drought is vital in drought monitoring and management. Drought indices, generally derived from station-wide meteorological and hydrological data representing the drought condition, are commonly used to monitor and assess droughts. They are generally reported for specific spatial scales such as climate division, county, hydrological unit etc. This study involves spatial interpolation of drought data and quantification of the uncertainty in drought reporting at different spatial scales. The Standardized Precipitation Index (SPI) with one month time step, a metrological drought index, from 57 stations across the State of North Dakota (ND), U.S., was used. Two interpolation methods, Inverse Distance Weighting (IDW) and Ordinary Kriging (OK) were evaluated for their performance using selected cross-validation parameters. The variability within each of the three spatial scales: county, climate division, and state were quantified based on interpolated values. This study found that (a) IDW with power one, and (b) OK with circular semivariogram model can be used for interpolation of the selected data obtained from the current distribution of stations. The standardized error surface from OK also can be used to improve the drought monitoring network. Significant variation of drought was found within each spatial scale. The predicted values of SPI were compared with reported values from commonly used drought reporting sources, and discussed with the perspective of uncertainty in relation to different spatial size.

Navaratnam Leelaruban, PhD, PE

Water Resources Engineer
Moore Engineering, Inc.

Presentation(s):

Send Email for Navaratnam Leelaruban


Assets

392990 - UNCERTAINTY IN DROUGHT REPORTING ACROSS DIFFERENT SPATIAL SCALES



Attendees who have favorited this

Please enter your access key

The asset you are trying to access is locked. Please enter your access key to unlock.

Send Email for UNCERTAINTY IN DROUGHT REPORTING ACROSS DIFFERENT SPATIAL SCALES