Geomorphology and landscape evolution of Save River delta, South-central Mozambique
(English)Manuscript (preprint) (Other (popular science, discussion, etc.))
The Save River delta has well-preserved geomorphological and sedimentological features with potential to reveal its evolution as well as past regional environmental changes, which are anticipated to integrate into other data at a global scale. In this study we mapped and integrated these features to understand the environmental processes that drove the late evolution of the delta. The results suggest that the present configuration of the delta was primarily dominated by a delta-front protruding into the sea, in a faulted coast section that may have favoured the formation of the depocenter. The development of the delta-front was initiated prior to c. 3100 cal. yrs BP, and around this age, fine-grained sediments started to accumulate on it forming a mangrove wetland deposit that expanded from the proximal sector of the delta to the current position shown in a geomorphological map. The results show successive dune ridges in the southern sector of the delta which indicate a series of consecutive shorelines over time as the delta prograded towards the current position. These dunes have created favourable conditions for accumulation of fine-grained sediments in the back-barrier sectors, contributing to the development of the mangrove wetland. An alluvial floodplain developed during the last millennium, probably a result of high precipitation the catchment area.
Delta evolution, Save River delta, mangrove wetland, delta progradation, Mozambique coast, coastal dunes
Research subject Physical Geography
IdentifiersURN: urn:nbn:se:su:diva-126049OAI: oai:DiVA.org:su-126049DiVA: diva2:897046