Bias correction of cmip5-based precipitation for hydrologic investigations
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Date
2022
Journal Title
Journal ISSN
Volume Title
Publisher
UMT.Lahore
Abstract
The Lower Jhelum River Basin possesses a hybrid topography due to which different
types of weather patterns can be seen throughout the year. This important aspect of
the catchment emphasizes to use Global Climate Models (GCM) extensively rather
than gauge products for various hydrological investigations. The main goal of this
study was to apply the bias correction technique on GCMs and to evaluate them for a
hybrid topography and determine how well they may be used for predicting the stream
flows. A strong relation was found to be existed between the gauge and the model.
The amount of error and the performance of the model was evaluated by using the
statistical and performance parameters for point precipitation, average basin rainfall
and entire study area. Flow routing was done to predict the stream flows for gauge,
ACCESS 1.0 and adjusted ACCESS 1.0 products for the years 2014 to 2019. The
upstream boundary condition, to accommodate the flows from upper basin, was
provided at Kohala station in the form of monthly hydrograph. The model showed
comparatively good results after applying the bias correction factor and the stream
flows were close to the gauge data.