Separation of the climatic and land cover impacts on the flow regime changes in two watersheds of Northeastern Tibetan Plateau

Yang, Linshan and Feng, Qi and Yin, Zhenliang and Deo, Ravinesh C. and Wen, Xiaohu and Si, Jianhua and Li, Changbin (2017) Separation of the climatic and land cover impacts on the flow regime changes in two watersheds of Northeastern Tibetan Plateau. Advances in Meteorology. ISSN 1687-9309

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Abstract

Assessment of the effects of climate change and land use/cover change (LUCC) on the flow regimes in watershed regions are fundamental research needs in terms of the management of water resources and eco-social sustainable developments. In this study, a statistical and modeling 14 combination method utilizing the Soil and Water Assessment Tool (SWAT) has been adopted in two watersheds of northeastern Tibetan Plateau in order to separate the individual impacts of climate and LUCC on the flow regime metrics. The results of the analyzed models confirm that the precipitation and streamflow first declined for the study period 1980 to 1995, and then it increased from the period 1996 to 2010 in the two watershed regions. In terms of the temperature, there was a significant increase in both variables within the two watersheds for the period 1980-2010. An evaluation of LUCC influence of both factors showed that the changes in the growth of vegetation, including the forestland, grassland and shrub area has increased gradually, while the barren area has decreased in Yingluoxia catchment (YLC) whereas no obvious change was evident in LUCC of Minxian catchment (MXC). The integrated effects of both LUCC and climate change appears to have led to an increase in the annual streamflow in the YLC region and a subsequent decline in the MXC region by approximately 3.2% and 4.3% of their total streamflow, respectively. It was interesting to note that climate change shown an opposite effect in two watersheds, leading to an increase in streamflow in YLC and a decline in MXC region, occupying approximately 107.3% and 93.75% of the total streamflow changes, respectively, reflection of climatic latitude effect on 29 streamflow. LUCC contributed to a decrease in streamflow by approximately 7.30% and 6.25% of the total streamflow changes. It is thus construed that the climatic factors contribute to more significant influence than LUCC on the magnitude, variability, duration and component of the flow regimes, implying that the climate certainly dominates the flow regime changes in northeastern Tibetan Plateau.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: ArticleFirst version made available under the Creative Commons Attribution License. We thank the staff in the Alashan Desert Eco-Hydrology Experimental Research Station for their indispensable help with the field investigation. Dr RC Deo acknowledges the CAS Presidential International Fellowship Initiative and USQ Academic Development and Outside Studies Program.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences
Date Deposited: 25 Sep 2017 01:44
Last Modified: 01 Nov 2017 02:19
Uncontrolled Keywords: climate change; LUCC; flow regimes; SWAT; Heihe River Basin; Taohe River Basin
Fields of Research : 05 Environmental Sciences > 0502 Environmental Science and Management > 050204 Environmental Impact Assessment
04 Earth Sciences > 0401 Atmospheric Sciences > 040107 Meteorology
04 Earth Sciences > 0401 Atmospheric Sciences > 040105 Climatology (excl.Climate Change Processes)
05 Environmental Sciences > 0502 Environmental Science and Management > 050206 Environmental Monitoring
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970104 Expanding Knowledge in the Earth Sciences
Identification Number or DOI: 10.1155/2017/6310401
URI: http://eprints.usq.edu.au/id/eprint/33003

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