Research School for Socio-Economic and
Natural Sciences of the Environment
Research School for Socio-Economic and
Natural Sciences of the Environment
Agenda

Uwimana Abias

Date: 28 November 2019
Time: 16:30 - 18:00

Dissertation title: 

Rehabilitation of sediments and nutrients retention capacity in valley bottom wetlands

Group: IHE Delft
Promotors: Anne van Dam and Kenneth Irvine

Extra information:

 
Abstract:

A study was conducted to assess the effects of land use and land cover and river discharge on water quality. Hydrological and water quality variables were measured at different catchment scales (catchments, reaches and mesocosms) in different periods from May 2009 to June 2013. Results showed higher concentrations of suspended solids during high flow periods. TN and TP concentrations followed a mechanism of buildup in the dry season, washout in early periods of high flows and dilution at the late stages of rainy periods. As opposed to wetlands, rice farming generates higher sediment, while fish farming stored (built up) TP and TN in sediments which are dredged out at the end of the rearing season. It is important to control sediment and nutrients losses at their critical stages of farming (ploughing  in rice farms and dredging for fish farming) through minimal disturbance of soil and sediment and nutrient recycling.