Forested and agricultural land use impacts on subsurface floodplain storage capacity using coupled vadose zone-saturated zone modeling

摘要: A floodplain study was implemented in central Missouri, USA, to better understand land use effects on storage capacity. Study sites included a heavily instrumented historic agricultural field (Ag) and remnant bottomland hardwood forest (BHF). The groundwater flow model MODFLOW used simulate hydrology for the study. calibrated using observed 2011 2012 water year data including precipitation, level, volumetric content (VWC), evapotranspiration (ET) estimated Penman–Monteith. performed similarly well both is considered robust given optimization constraints, as supported by fit head (BHF: Root Mean Square Error or RMSE = 0.40 m; Ag: 0.31 m), VWC 2.5 %; 2.3 %), ET 0.74 mm; 0.84 mm). Model predictions full vertical profile at BHF site (median 520 mm) indicated 28 % more vadose zone than Ag 409 median percent difference basis. On cumulative basis, accepted 117 mm (75 %) into site. Subsurface differences between two were likely, least part, result of subsurface paths rates, which differed 16 (BHF > Ag). Results highlight several important types support re-establishment riparian forests floodplains Midwest strategy address increasing flood concerns.