Record Details

Prediction of daily rainfall state in a river basin using statistical downscaling from GCM output

DSpace at IIT Bombay

View Archive Info
 
 
Field Value
 
Title Prediction of daily rainfall state in a river basin using statistical downscaling from GCM output
 
Creator KANNAN, S
GHOSH, S
 
Subject HIDDEN MARKOV MODEL
ATMOSPHERIC CIRCULATION PATTERNS
SPACE-TIME MODEL
CLIMATE-CHANGE
DAILY PRECIPITATION
STOCHASTIC GENERATION
NONPARAMETRIC MODEL
REGIONAL SCALES
AIR-FLOW
WEATHER
Climate change
Statistical downscaling
Clustering
Cluster validation indices
Classification trees
Decision trees
 
Description Conventional statistical downscaling techniques for prediction of multi-site rainfall in a river basin fail to capture the correlation between multiple sites and thus are inadequate to model the variability of rainfall. The present study addresses this problem through representation of the pattern of multi-site rainfall using rainfall state in a river basin. A model based on K-means clustering technique coupled with a supervised data classification technique, namely Classification And Regression Tree (CART), is used for generation of rainfall states from large-scale atmospheric variables in a river basin. The K-means clustering is used to derive the daily rainfall state from the historical daily multi-site rainfall data. The optimum number of clusters in the observed rainfall data is obtained after application of various cluster validity measures to the clustered data. The CART model is then trained to establish relationship between the daily rainfall state of the river basin and the standardized, dimensionally-reduced National Centers for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR) reanalysis climatic data set. The relationship thus developed is applied to the General Circulation Model (GCM)-simulated, standardized, bias free large-scale climate variables for prediction of rainfall states in future. Comparisons of the number of days falling under different rainfall states for the observed period and the future give the change expected in the river basin due to global warming. The methodology is tested for the Mahanadi river basin in India.
 
Publisher SPRINGER
 
Date 2012-06-26T05:16:21Z
2012-06-26T05:16:21Z
2011
 
Type Article
 
Identifier STOCHASTIC ENVIRONMENTAL RESEARCH AND RISK ASSESSMENT,25(4)457-474
1436-3240
http://dx.doi.org/10.1007/s00477-010-0415-y
http://dspace.library.iitb.ac.in/jspui/handle/100/13945
 
Language English