Hydraulics/Hydrology CE Seminar Series
Spatio-temporal Characterization of Climate and Land Use Change Impacts on Blue and Green Water Dynamics over the Ohio River
Lyles School of CIvil Engineering
Tuesday, October 6, 2015
Climate and land use changes have great impacts on water availability. Most of current studies concern on conventional liquid water (blue water), but ignore the portion of water stored in soils or plants (green water), which can go back to the atmosphere through evapotranspiration. The objective of this study is to present a comprehensive assessment of the spatial and temporal trend of blue water and green water under the historical climate and land use conditions in the Ohio River Basin over the period of 1935 to 2014, and then quantify the relative effects of climate and land use changes on blue water and green water. The Soil and Water Assessment Tool (SWAT) is adopted to simulate hydrologic fluxes for the entire basin, and the Mann-Kendall and Theil-Sen tests are employed to detect statistical trends separately at three different scales, i.e. the entire basin, regional, and subbasin levels. The results show that the overall blue and green water has increased over the whole basin, but the changes in their annual average values during the period of simulation reveal a distinctive spatial pattern. Furthermore, by separating the contributions of climate and land use change, we find that effect of climate change in the Ohio River Basin has been prominent on BW, while the impact is relatively nominal on GW; whereas, land use change increases GW remarkably, but is counterproductive on BW. The results help understanding the influence of human impacts on hydrologic responses in the Ohio River basin.
Liuying Du received her B.S. in Hydraulic and Hydroelectric Engineering from Sichuan University in 2014. She is currently pursuing a MSCE at Purdue University with an emphasis in Hydraulics & Hydrology. Her research interest is to quantify the impact of climate and land use change on water resources.