The dynamics of cultivation and floods in arable lands of Central Argentina. Viglizzo, E., Jobbágy, E., Carreño, L., Frank, F., Aragón, R, de Oro, L, & Salvador, V Hydrology and Earth System Sciences, 13:491–502, April, 2009. Paper abstract bibtex Although floods in watersheds have been associated with land-use change since ancient times, the dynamics of flooding is still incompletely understood. In this paper we explored the relations between rainfall, groundwater level, and cultivation to explain the dynamics of floods in the extremely flat and valuable arable lands of the Quinto river watershed, in central Argentina. The analysis involved an area of 12.4 million hectare during a 26-year period (1978–2003), which comprised two extensive flooding episodes in 1983–1988 and 1996–2003. Supported by information from surveys as well as field and remote sensing measurements, we explored the correlation among precipitation, groundwater levels, flooded area and land use. Flood extension was associated to the dynamics of groundwater level. While no correlation with rainfall was recorded in lowlands, a significant correlation (P\textless0.01) between groundwater and rainfall in highlands was found when estimations comprise a time lag of one year. Correlations between groundwater level and flood extension were positive in all cases, but while highly significant relations (P\textless0.01) were found in highlands, non significant relations (P\textgreater0.05) predominate in lowlands. Our analysis supports the existence of a cyclic mechanism driven by the reciprocal influence between cultivation and groundwater in highlands. This cycle would involve the following stages: (a) cultivation boosts the elevation of groundwater levels through decreased evapotranspiration; (b) as groundwater level rises, floods spread causing a decline of land cultivation; (c) flooding propitiates higher evapotranspiration favouring its own retraction; (d) cultivation expands again following the retreat of floods. Thus, cultivation would trigger a destabilizing feedback self affecting future cultivation in the highlands. It is unlikely that such sequence can work in lowlands. The results suggest that rather than responding directly and solely to the same mechanism, floods in lowlands may be the combined result of various factors like local rainfall, groundwater level fluctuations, surface and subsurface lateral flow, and water-body interlinking. Although the hypothetical mechanisms proposed here require additional understanding efforts, they suggest a promising avenue of environmental management in which cultivation could be steered in the region to smooth the undesirable impacts of floods.
@article{viglizzo_dynamics_2009,
title = {The dynamics of cultivation and floods in arable lands of {Central} {Argentina}},
volume = {13},
url = {http://www.hydrol-earth-syst-sci.net/13/491/2009/hess-13-491-2009.pdf},
abstract = {Although floods in watersheds have been associated with land-use change
since ancient times, the dynamics of flooding is still incompletely
understood. In this paper we explored the relations between rainfall,
groundwater level, and cultivation to explain the dynamics of floods in
the extremely flat and valuable arable lands of the Quinto river
watershed, in central Argentina. The analysis involved an area of 12.4
million hectare during a 26-year period (1978--2003), which
comprised two extensive flooding episodes in 1983--1988 and
1996--2003. Supported by information from surveys as well as field
and remote sensing measurements, we explored the correlation among
precipitation, groundwater levels, flooded area and land use. Flood
extension was associated to the dynamics of groundwater level. While no
correlation with rainfall was recorded in lowlands, a significant
correlation (P{\textless}0.01) between groundwater and rainfall in highlands
was found when estimations comprise a time lag of one year. Correlations
between groundwater level and flood extension were positive in all
cases, but while highly significant relations (P{\textless}0.01) were found in
highlands, non significant relations (P{\textgreater}0.05) predominate in
lowlands. Our analysis supports the existence of a cyclic mechanism
driven by the reciprocal influence between cultivation and groundwater
in highlands. This cycle would involve the following stages: (a)
cultivation boosts the elevation of groundwater levels through decreased
evapotranspiration; (b) as groundwater level rises, floods spread
causing a decline of land cultivation; (c) flooding propitiates higher
evapotranspiration favouring its own retraction; (d) cultivation expands
again following the retreat of floods. Thus, cultivation would trigger a
destabilizing feedback self affecting future cultivation in the
highlands. It is unlikely that such sequence can work in lowlands. The
results suggest that rather than responding directly and solely to the
same mechanism, floods in lowlands may be the combined result of various
factors like local rainfall, groundwater level fluctuations, surface and
subsurface lateral flow, and water-body interlinking. Although the
hypothetical mechanisms proposed here require additional understanding
efforts, they suggest a promising avenue of environmental management in
which cultivation could be steered in the region to smooth the
undesirable impacts of floods.},
journal = {Hydrology and Earth System Sciences},
author = {Viglizzo, EF and Jobbágy, EG and Carreño, LV and Frank, FC and Aragón, R and de Oro, L and Salvador, V},
month = apr,
year = {2009},
keywords = {crn2031, iai\_la\_plata\_basin},
pages = {491--502}
}
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In this paper we explored the relations between rainfall, groundwater level, and cultivation to explain the dynamics of floods in the extremely flat and valuable arable lands of the Quinto river watershed, in central Argentina. The analysis involved an area of 12.4 million hectare during a 26-year period (1978–2003), which comprised two extensive flooding episodes in 1983–1988 and 1996–2003. Supported by information from surveys as well as field and remote sensing measurements, we explored the correlation among precipitation, groundwater levels, flooded area and land use. Flood extension was associated to the dynamics of groundwater level. While no correlation with rainfall was recorded in lowlands, a significant correlation (P\\textless0.01) between groundwater and rainfall in highlands was found when estimations comprise a time lag of one year. Correlations between groundwater level and flood extension were positive in all cases, but while highly significant relations (P\\textless0.01) were found in highlands, non significant relations (P\\textgreater0.05) predominate in lowlands. Our analysis supports the existence of a cyclic mechanism driven by the reciprocal influence between cultivation and groundwater in highlands. This cycle would involve the following stages: (a) cultivation boosts the elevation of groundwater levels through decreased evapotranspiration; (b) as groundwater level rises, floods spread causing a decline of land cultivation; (c) flooding propitiates higher evapotranspiration favouring its own retraction; (d) cultivation expands again following the retreat of floods. Thus, cultivation would trigger a destabilizing feedback self affecting future cultivation in the highlands. It is unlikely that such sequence can work in lowlands. The results suggest that rather than responding directly and solely to the same mechanism, floods in lowlands may be the combined result of various factors like local rainfall, groundwater level fluctuations, surface and subsurface lateral flow, and water-body interlinking. Although the hypothetical mechanisms proposed here require additional understanding efforts, they suggest a promising avenue of environmental management in which cultivation could be steered in the region to smooth the undesirable impacts of floods.","journal":"Hydrology and Earth System Sciences","author":[{"propositions":[],"lastnames":["Viglizzo"],"firstnames":["EF"],"suffixes":[]},{"propositions":[],"lastnames":["Jobbágy"],"firstnames":["EG"],"suffixes":[]},{"propositions":[],"lastnames":["Carreño"],"firstnames":["LV"],"suffixes":[]},{"propositions":[],"lastnames":["Frank"],"firstnames":["FC"],"suffixes":[]},{"propositions":[],"lastnames":["Aragón"],"firstnames":["R"],"suffixes":[]},{"propositions":["de"],"lastnames":["Oro"],"firstnames":["L"],"suffixes":[]},{"propositions":[],"lastnames":["Salvador"],"firstnames":["V"],"suffixes":[]}],"month":"April","year":"2009","keywords":"crn2031, iai_la_plata_basin","pages":"491–502","bibtex":"@article{viglizzo_dynamics_2009,\n\ttitle = {The dynamics of cultivation and floods in arable lands of {Central} {Argentina}},\n\tvolume = {13},\n\turl = {http://www.hydrol-earth-syst-sci.net/13/491/2009/hess-13-491-2009.pdf},\n\tabstract = {Although floods in watersheds have been associated with land-use change\nsince ancient times, the dynamics of flooding is still incompletely\nunderstood. In this paper we explored the relations between rainfall,\ngroundwater level, and cultivation to explain the dynamics of floods in\nthe extremely flat and valuable arable lands of the Quinto river\nwatershed, in central Argentina. The analysis involved an area of 12.4\nmillion hectare during a 26-year period (1978--2003), which\ncomprised two extensive flooding episodes in 1983--1988 and\n1996--2003. Supported by information from surveys as well as field\nand remote sensing measurements, we explored the correlation among\nprecipitation, groundwater levels, flooded area and land use. Flood\nextension was associated to the dynamics of groundwater level. While no\ncorrelation with rainfall was recorded in lowlands, a significant\ncorrelation (P{\\textless}0.01) between groundwater and rainfall in highlands\nwas found when estimations comprise a time lag of one year. Correlations\nbetween groundwater level and flood extension were positive in all\ncases, but while highly significant relations (P{\\textless}0.01) were found in\nhighlands, non significant relations (P{\\textgreater}0.05) predominate in\nlowlands. Our analysis supports the existence of a cyclic mechanism\ndriven by the reciprocal influence between cultivation and groundwater\nin highlands. This cycle would involve the following stages: (a)\ncultivation boosts the elevation of groundwater levels through decreased\nevapotranspiration; (b) as groundwater level rises, floods spread\ncausing a decline of land cultivation; (c) flooding propitiates higher\nevapotranspiration favouring its own retraction; (d) cultivation expands\nagain following the retreat of floods. Thus, cultivation would trigger a\ndestabilizing feedback self affecting future cultivation in the\nhighlands. It is unlikely that such sequence can work in lowlands. 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