02190naa a2200265 a 450000100080000000500110000800800410001910000200006024500990008026000090017952014570018865000130164565000180165865000160167665000160169265300170170865300170172565300150174265300150175765300160177265300180178870000200180670000200182677300780184617873602017-04-04       1998    bl ---       0--  u    #d1 aHAMILTON, S. K.  aDynamics of floodplain inundation in the alluvial fan of the Taquari river (Pantanal, Brazil).  c1998  aThe Taquari River flows across an immense alluvial fan of&gt50.000 km2, most of which is subject to seasonal inundadtion and is covered by sandy soils and savanna vegetation. Sampling at the mouth of the river over the course of the year showed that the turbid waters of the Taquari lose nearly all of their sediment load before reaching the Paraguay River because they they become impounded in an internal delta of anastomosed channels and luxuriant semiaquatic vegetation. Across much of the alluvial fan, however, local rainfall rather than the Taquari River is the source of seasonal flooding, and this imparts some important hydrological and ecological differences to the floodplain. The chemical composition of rainfall-dominanted floodwaters differs from that of the river and major ion data sites acros the region reveal the origin of the waters as well as the degree of avapoconcentration occurring along floodplain flow paths. Differences in inundation dynamics between river and rainfall-dominated floodplain are revealed by passive microwaye satellite data, which provide a 9-year time series of inundation intensity at monthly resolution. Human impacts on the inundation dynamics have occured through damming of openings along the riverr levees and possibility through increased erosions as the upland drainage basin has been converted to agricultural use. These actions have a potentially serious effect on the ecology of the floodplains.  aPantanal  aConservação  aEcossistema  aInundação  aArea alagada  aConservation  aFloodplain  aInundation  aRio Taquari  aTaquari river1 aSOUZA, O. C. de1 aCOUTINHO, M. E.  tVerhandlungen International Vereiniging Limnologygv.26, p.916-922, 1998.