HR: 16:15h
AN: H14E-02 INVITED    [Abstracts]
TI: Unsteady Climate, Groundwater Recharge, and Human Influence
AU: * Loaiciga, H A
EM: hugo@geog.ucsb.edu
AF: Department of Geography/UCSB, Department of Geography/UCSB, Santa Barbara, CA 93106, United States
AB: Recharge is arguably the starting point of the groundwater hydrologic cycle. It marries above-ground hydrologic and climatic processes –runoff, precipitation, evapotranspiration- with groundwater flow and biochemical dynamics. This paper focuses on unsteady climate and ground water recharge linkages. Unsteady climate by virtue of its seasonal and inter-annual fluctuations or by shifts in the earth-atmosphere's radiative budget caused by secular forcing. Recharge is primarily caused by spatially diffuse percolation or by streamflow seepage. These two mechanisms are briefly reviewed. Examples of regional recharge governed by unsteady climate and affected by unsteady population are presented. Questions are raised about climate-recharge-human feebacks, and adaptation possibilities are proposed.
DE: 1616 Climate variability (1635, 3305, 3309, 4215, 4513)
DE: 1807 Climate impacts
DE: 1829 Groundwater hydrology
DE: 1875 Vadose zone
SC: Hydrology [H]
MN: 2007 Fall Meeting