Abstract
Some sedimentological characteristics of #uvial environments located in the northeastern region of the Chaco}Pampa plain were analysed in order to determine the possible in#uence of the loessic headwaters of local basins. Concentrations of suspended sediments, as well as grain size of the river beds, were compared. Unexpectedly, it was found that the suspended load has an inverse relationship with the hydrometric levels, with the exception of highly saline streams (conductivity values between 4300 and 11,000 l Sc m~1). The mean concentration of suspended sediments was 63.1 and 206.3 mg l~1 in #ood and low water periods, respectively. The grain size of bed sediments was relatively homogeneous along the whole hydrological cycle. Sandy}silty bottoms predominate in channels, followed by silty}sandy and clayey}silty bottom types. Sediment transport mainly occurs in accelerating #ow suspension, overcoming the critical erosion velocity. During #ood periods, some parameters exceeded by 70% the values recorded during the low water phase. ( 2000 Elsevier Science Ltd and INQUA. All rights reserved.
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