Effects of Wetland Conversion to Farming on Water Quality and Sediment and Nutrient Retention in a Tropical Catchment: 1st Edition (Paperback) book cover

Effects of Wetland Conversion to Farming on Water Quality and Sediment and Nutrient Retention in a Tropical Catchment

1st Edition

By Abias Uwimana

CRC Press

150 pages

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Paperback: 9780367859732
pub: 2020-01-16
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The study used a combination of landscape-scale synoptic surveys (catchment, reaches) and mesocosm surveys (experimental plots) to assess the impacts of conversion of natural valley-bottom wetlands to farming land on the water quality and retention of sediment and nutrients. The results showed that temperature, pH, electrical conductivity and dissolved oxygen concentration decreased, and total suspended solids (TSS) increased with storm water increase. Nitrogen (TN) and phosphorus (TP) accumulated in the catchment during the dry season and washed into the water courses during the early stages of the higher flows, with subsequent lower concentrations at the end of the rains due to dilution. Large proportions of the annual loads of TSS, TP and TN (93%, 60% and 67%, respectively) were transported during rainfall events that occurred in 115 days. Fishponds acted as temporal traps of TSS, TN and TP at the early stages of farming, and were a source of and TN and TP at the end of the farming period, in contrast to rice farming that generated sediments and nutrients early in the farming period and trapped them at the end of the farming season. Wetlands mostly acted as sinks but sometimes as a source of sediment and nutrients.

Table of Contents

Seasonal Water Discharge in a tropic Catchment, Seasonal Water quality dynamics in a tropic Catchment, Seasonal Land use and land cover dynamics in a tropic Catchment, Effects of river discharge and land use and land cover (LULC) on water quality dynamics in tropic catchment, Retention of sediment, nitrogen and phosphorus in tropic catchment, Hydrological flows in mesocosm experimental land and land cover, Water quality in mesocosm experimental land and land cover, Effects of conversion of wetlands to rice and fish farming on water quality in a tropic catchment.

About the Author

Abias Uwimana was born on 8 September 1975 at Kora, Gisenyi in Rwanda. After completing his primary and secondary education, he served as a primary school teacher at Kijote Primary School from 1999 to 2000. From 2000, he enrolled in the Bachelor's programme at the National University of Rwanda (NUR) and graduated in Chemistry in 2005. In 2007, he started his MSc studies in Water Resources and Environmental Management at NUR and graduated in 2008. In the same year, he started working at NUR as Assistant Lecturer and Laboratory Analyst for water quality. In 2009, he started his PhD studies at the IHE Delft Institute for Water Education in Delft, The Netherlands, conducting his PhD research activities while continuing his academic duties at the university, including teaching courses on environmental chemistry and management and water quality analysis, performing laboratory analyses, and supervision of BSc and Msc theses. As a laboratory analyst he took part in the Victoria Research (VICRES) project on assessment of water quality in the Akagera River since 2008-2009. In 2016, he received an international Travel Award to Corpus Christi, Texas, USA to present his work at the Annual Meeting of the Society of Wetland Scientists. Abias Uwimana is married and has three children.

About the Series

IHE Delft PhD Thesis Series

IHE Delft PhD programme leads to a deepening of a field of specialisation. PhD fellows do scientific research, often with conclusions that directly influence their region. At IHE Delft, PhD researchers from around the world participate in problem-focused and solution-oriented research on development issues, resulting in an inspiring research environment. PhD fellows work together with other researchers from many countries dealing with topics related to water and the environment.

PhD research is often carried out in the ‘sandwich’ model. Preparation and final reporting – the first and last portion of the programme – are carried out in Delft, while actual research is done in the fellow’s home country, under co-supervision of a local institute. Regular contacts with the promotor are maintained through visits and long-distance communication. This enables researchers to employ solutions directly to problems in their geographical region.

IHE Delft PhD degrees are awarded jointly with a university. The degrees are highly valued and fully recognised in all parts of the world.

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Subject Categories

BISAC Subject Codes/Headings:
SCIENCE / Environmental Science
TECHNOLOGY & ENGINEERING / Environmental / Water Supply