Citizens Science Perspectives on Drivers of Sedimentation in the Lusitu River Catchment in Chirundu District, Zambia

Abstract

The problem of sediment generation is very pronounced in Southern Zambia and, Lusitu River Catchment in particular. Despite numerous positivistic and geophysical explanations on factors influencing sedimentation, there is still a gap regarding comprehensive understanding of citizens science-based perspectives in the study of geophysical processes, specifically around sedimentation. Previous research has primarily focused on mapping land-use changes and assessing the impact of livelihood activities on geomorphic changes using techniques such as GIS, SWAT, and others, but with minimal or no consideration given to the role of citizens scientific perspectives. The study was informed by analytic eclecticism paradigm and used mixed methodology that was inherently citizens science. Data was collected using observation and semi-structured interviews and was analysed using descriptive statistics namely, mean, standard deviation, coefficient of variation and, thematic analysis. The results showed that agricultural activities particularly, dry season crop field preparation prior to the onset of rainfall and intensive soil tillage farming practices were the major drivers of sedimentation of the Lusitu River. Geomorphic factors driving sedimentation of Lusitu River were gully erosion, loose soils (Leptosols), unstable riverbanks and weak sedimentary rock formations. Addressing the drivers of sedimentation in the Lusitu region requires a holistic approach that recognizes the importance of citizens’ scientific perspectives. Efforts should focus on raising awareness and engaging with local communities to promote sustainable land and water management practices. This includes integrating traditional knowledge with modern scientific methods, fostering community participation in decision-making processes, and providing access to resources and education. The paper says that, understanding drivers of sedimentation in hydrological systems is a function of understanding not only the geophysical process independent of human perspectives, but also the citizens’ scientific perspectives.