Human impacts on terrestrial hydrology: climate change versus pumping and irrigation

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Title
Human impacts on terrestrial hydrology: climate change versus pumping and irrigation
Title of Series
Author
Ferguson, Ian M.
Maxwell, Reed M.
License
CC Attribution - NonCommercial - ShareAlike 3.0 Unported:
You are free to use, adapt and copy, distribute and transmit the work or content in adapted or unchanged form for any legal and non-commercial purpose as long as the work is attributed to the author in the manner specified by the author or licensor and the work or content is shared also in adapted form only under the conditions of this license.
DOI
Publisher
Institute of Physics (IOP)
Release Date
2012
Language
English

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Abstract
Global climate change is altering terrestrial water and energy budgets, with subsequent impacts on surface and groundwater resources; recent studies have shown that local water management practices such as groundwater pumping and irrigation similarly alter terrestrial water and energy budgets over many agricultural regions, with potential feedbacks on weather and climate. Here we use a fully-integrated hydrologic model to directly compare effects of climate change and water management on terrestrial water and energy budgets of a representative agricultural watershed in the semi-arid Southern Great Plains, USA. At local scales, we find that the impacts of pumping and irrigation on latent heat flux, potential recharge and water table depth are similar in magnitude to the impacts of changing temperature and precipitation; however, the spatial distributions of climate and management impacts are substantially different. At the basin scale, the impacts on stream discharge and groundwater storage are remarkably similar. Notably, for the watershed and scenarios studied here, the changes in groundwater storage and stream discharge in response to a 2.5 °C temperature increase are nearly equivalent to those from groundwater-fed irrigation. Our results imply that many semi-arid basins worldwide that practice groundwater pumping and irrigation may already be experiencing similar impacts on surface water and groundwater resources to a warming climate. These results demonstrate that accurate assessment of climate change impacts and development of effective adaptation and mitigation strategies must account for local water management practices.

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Szemerédi Maxwell and I'm assistive offensive hydrology in the geological Engineering department horror school lines and I direct the integrated modeling Center were ranges in
anthropogenic effects on water resources in the hydrologic cycle and when most people think the facts they think climate change a broad-scale changes in precipitation temperature due to changes in the house cats it's progenitor really just means any human-induced factors and these communities factors can be water management they can be urbanization and the particular antigenic effects that were interested in irrigation and pumping and pumping for for domestic use of variation in sort of combined pumping irrigation facts I mean
Ferguson so engineering had rather severe reclamation groundwater pumping for
irrigation purposes is a major water use to our going got great plains region are
particular say site isn't in the little washer watershed which sits within the so the great plains of North America what we feel is that even though it's regional-scale watershed that it's representative of the greater the result to represent the greater so the great plains in these sorts of groundwater fed agricultural regions in the research we did both looked
at the science side the system the physical hydrology as well as the management implications of anthropogenic effects we develop the scenarios we ran the scenarios with an integrated had a lot of model and we evaluated have and compare the differences between the control situation where we have no Brouwer pumping your irrigation and historic climate conditions and so is if the basin were just in its natural state without humans ever influencing it and then we compare those results to projections of what would happen to climate change and what would happen under a certain very realistic necessary what we use is
a all culpa flown power flow is an integrated hydrologic model and that takes advantage of parallel computing and small office and surface water streams and lakes and rivers and is a fully connected to the rest of hydrologic system this models only possible because of high performance computing has been run these large-scale models across many different compute processes such as computer that we use on campus which is rot which is
which is a 2000 roughly 2000 core
supercomputers we have here on campus and what we
found was actually pre surprising the local effects and we talk about impacts on growl adapt impacts on the surface runoff the local effects of climate change are very similar to what we're already seeing in terms of local effects of ghrelin pumping in irrigation out into prime examples there are pumping lowers the water table would pump more than an hour recharge law the water table and that has feedbacks on soil moisture in the root zone out for shallow groundwater and has feedbacks on evapotranspiration from the surface as well and we actually see similar feedbacks when we increase air temperature right to an degrees so looking at
figure 2 from our paper on the left hand side of the figure shows cumulative evapotranspiration run off and net recharge on the right hand side we show the difference in these differences you can see particularly for runoff are very similar in some cases in the winter to
line up as almost and came this is really surprising
because with this suggests is that we might be seeing these effects already so basins that are heavily most basins are most agricultural regions are heavily managed plot of public variations on variation this changes the hydrologic cycle and these basins of probably already a surrogate ways for future climate type impact
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