Impact of climate change on tarbela reservoir watershed by gis
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Date
2022
Journal Title
Journal ISSN
Volume Title
Publisher
UMT.Lahore
Abstract
Environmental fluctuations present a serious hazard to the world's water supply systems.
It is evident that different trends in precipitation and rising temperatures can be found
across the nation. Unexpected droughts and floods have become more frequent during the
past century.
The project's goal is to use Arc-SWAT to evaluate Tarbela catchment characteristics,
identify watersheds, and study the effects of climate change on Tarbela reservoir inflows.
In order to achieve this, DEMs were gathered from the USGS website, weather and rainfall
information from the Swat website, a 2021 satellite image from the USGS Earth Explorer,
and soil information from the Food and Agriculture Organization, respectively.
The SWAT model was subsequently calibrated through the use of the SWAT CUP
programme. In order to calibrate the system, the measured flows were compared to the
simulated flows. The initial model was calibrated daily during 2010, but only after a
sufficient number of R2
and NSE iterations (>0.5). The final result were calibrated. The
model has since been adjusted annually, monthly, for inflow (1994-2015), and the year
2010. The yearly calibration (1994–2015) is 0.778 and 0.523, respectively, with the
monthly calibration coefficient R2
and Nash Sutcliffe coefficient (NES) being 0.82 and
0.877, respectively. If both the R2
and Nash-Sutcliffe Coefficient (NSE) are greater than
0.5, the calibration is adequate. R2
and Nash-monthly Sutcliffe's calibration values are 0.82
and 0.877, respectively.
In order to adjust for this swing in precipitation and temperature, the available rainfall and
temperature data was interpolated and employed as the input in SWAT model.