1. Influence of rainfall recharge on suspended sediment yields in the Piracicaba drainage basin in southeastern Brazil
- Author
-
Jefferson Mortatti, Helder de Oliveira, and Diego Vendramini
- Subjects
Hydrology ,geography ,geography.geographical_feature_category ,Drainage basin ,Sediment ,Hydrograph ,04 agricultural and veterinary sciences ,Groundwater recharge ,010501 environmental sciences ,Structural basin ,01 natural sciences ,040103 agronomy & agriculture ,0401 agriculture, forestry, and fisheries ,Environmental science ,Precipitation ,Surface runoff ,Sediment transport ,0105 earth and related environmental sciences ,Water Science and Technology - Abstract
A study on fine-suspended sediment (FSS) yield dynamics was performed in the Piracicaba River drainage basin in the state of Sao Paulo, Brazil, during an entire hydrological year, and a set of nine flood hydrographs that encompass wet and dry seasons were analysed. The average-specific sediment transport was 88 t km−2 y−1. Hydrograph analysis verified that the lowest sediment yield, totalling 313 t, was related to the driest season of the hydrological year; whereas, the highest yield, amounting to 196,000 t, was related to the season of heaviest rainfall. Both unit hydrographs lasted 10 consecutive days, yet they were obtained under adverse hydrological conditions, with accumulated precipitation in the dry and wet seasons of 14 and 319 mm, respectively, which likely gave rise to different soil saturation levels and changes in surface runoff. This increase in FSS yield, which is greater than 600-fold, is possibly related not only to the different hydrological conditions, but also to the use and occ...
- Published
- 2017