SWAT Literature Database for Peer-Reviewed Journal Articles

Title:Discussion of “Multiscale assessment of the impacts of climate change on water resources in Tanzania” by Umesh Adhikari A. Pouyan Nejadhashemi, Matthew R. Herman, and Joseph P. Messina 
Authors:Zolghadr-Asli, B. 
Journal:Journal of Hydrologic Engineering 
Volume (Issue):22(8) 
Article ID:07017010 
URL (non-DOI journals): 
Broad Application Category:comment, correction, discussion, erratum, letter or response 
Primary Application Category:uncertainty analysis 
Secondary Application Category:climate change 
Watershed Description:see general comment 
Calibration Summary: 
Validation Summary: 
General Comments:The watershed this discussion contribution is focused on is described in the original article which is also accessible in the SWAT Literature Database: Adhikari, U., A. P. Nejadhashemi, M. R. Herman, and J. P. Messina. 2017. Discussion of “Multiscale assessment of the impacts of climate change on water resources in Tanzania”. Journal of Hydrologic Engineering. 22(8): 07017010. Doi: 10.1061/(ASCE)HE.1943-5584.0001467. 
Abstract:In order to assess the potential impacts of climate change on Tanzania’s water resources in the mid-21st century, the authors introduced the projection of six global circulation models (GCMs) under the most extreme emission scenario (RCP8.5) as inputs to a widely used process-based hydrological model, namely, soil and water assessment tool (SWAT), and retrieved the predicted time series of precipitation, potential and actual evapotranspiration, surface runoff, water yields, and soil moisture. To achieve realistic and accurate results, the study area was divided into three general categories: country-level, watershed-level, and subbasin-level. Generally speaking, the projected climatic behavior was found to create more favorable conditions for agricultural production during wet seasons because of an increase in the water supply, whereas in dry seasons less favorable conditions were to be expected. The authors made a tremendous effort to include a considerable number of hydrological and meteorological variables, given that their research was conducted on a significantly large-scale. This attempt is not only admirable due to numerate variables analyzation, but for consideration of variables such as soil moisture, which have been neglected in many studies by scholars. Moreover, this detailed analyzation was conducted not only through the entire country, which makes the results extremely valuable, but also the results were categorized and assessed in both seasonal and annual time steps, a vital attempt in water resources’ operation perspective. Therefore the discussers would like to show their gratitude to the authors of the original manuscript for their exceptional research. This paper contains a brief discussion on how the applied methodology could have been modified so that a more comprehensive perspective over the potential impacts of climate change could have been achieved. For the sake of argument, the proposed contents were categorized under two topics: emission scenarios and downscaling methods.