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Title (Primary) Influence of soil textural properties on hydrologic fluxes in the Mississippi river basin
Author Livneh, B.; Kumar, R.; Samaniego, L.;
Journal Hydrological Processes
Year 2015
Department CHS;
Volume 29
Issue 21
Language englisch;
POF III (all) T34;
Keywords Regional-scale land-surface modeling; Hydrologic extremes; Soil moisture and runoff persistence; Hydropedology; STATSGO2 and HWSD; Soil textural uncertainty; pedotransfer functions
UFZ wide themes RU5;
Abstract Hydrological simulation of states and fluxes represents a viable approach for predicting the occurrence of extreme events and diagnosing their underlying causes. In recent decades, databases of soil textural properties have been published that provide a basis for estimating hydrologic model parameters. The aim of this study is to quantify the impact of soil textural assumptions on hydrologic states and fluxes: an often overlooked source of hydrologic modeling uncertainty. Mesoscale hydrologic model simulations driven by the STATSGO2 soil database (1:250,000) were compared with those using the FAO-based HWSD database (1:5,000,000) over the Mississippi river basin. Annual and seasonal differences in modeled water fluxes and states were explored, in addition to major historical flood and drought events during 1988, 1993, and 2012. Model simulations using STATSGO2 consistently led to greater separation between fast and slow runoff responses (by approximately 24-39%) and generally more extreme response to historic flood and drought events. Simulated soil moisture and runoff from the coarser HWSD database produced greater persistence by roughly 0.10 autocorrelation points at 1, 3, and 6 month lags, due to larger active water storage capacity. Overall, the choice of soil database altered the partitioning of precipitation between evapotranspiration and runoff, and affected the correlation structure between forcing and modeled fluxes by up to 0.2 points. As compared with other decisions needed to make hydrologic predictions, this analysis demonstrates that choice of soil textural properties for a single model can be an appreciable source of uncertainty and therefore warrants careful consideration.
ID 16308
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Livneh, B., Kumar, R., Samaniego, L. (2015):
Influence of soil textural properties on hydrologic fluxes in the Mississippi river basin
Hydrol. Process. 29 (21), 4638 - 4655