Joshua Ahmed

Joshua Ahmed
  • PhD, MESci Environmental Geoscience
  • Leverhulme Trust Early Career Research Fellow at University of Hull

About

9
Publications
3,250
Reads
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408
Citations
Introduction
I have broad interests in fluvial geomorphology and am particularly interested in the evolution and functioning of meandering river systems. I am fascinated by the causes and consequences of meander migration and how floodplain habitat can be created and destroyed. My current research focuses on the physiochemical evolution of oxbow lakes in the Amazon Basin. My work has mainly focused on meandering rivers in the Amazon Basin and in Wales using remote sensing archives and GIS.
Current institution
University of Hull
Current position
  • Leverhulme Trust Early Career Research Fellow

Publications

Publications (9)
Article
Full-text available
Oxbow lakes are iconic fluvial landforms found in the floodplains of meandering rivers around the world. Their formation is associated with meander cutoff, a process that excises sections of river channel to optimise the downstream transmission of water and sediment. Overbank floods and conveyance through tie channels maintain some hydrological con...
Article
Full-text available
The existence of ancient fluvial systems on Mars is widely accepted, but little is known about how quickly they formed, or what environmental conditions controlled their evolution. We analyzed a sequence of well-preserved inner-bank bar deposits within the meander bends of a multistacked sinuous fluvial ridge in Aeolis Dorsa and compared them to si...
Article
Full-text available
Sediment supplies are a fundamental component of alluvial river systems, but the importance of sustained supplies of externally derived sediments for the evolution of meandering planforms remains unclear. Here we demonstrate the importance of sediment supply in enhancing the growth of point bars that influence the rate of sinuosity increase through...
Article
Full-text available
The role of externally imposed sediment supplies on the evolution of meandering rivers and their floodplains is poorly understood, despite analytical advances in our physical understanding of river meandering. The Amazon river basin hosts tributaries that are largely unaffected by engineering controls and hold a range of sediment loads, allowing us...
Article
Full-text available
Hedgerows are a key component of the UK landscape that form boundaries, borders and limits of land whilst providing vital landscape‐scale ecological connectivity for a range of organisms. They are diverse habitats in the agricultural landscape providing a range of ecosystem services. Poorly managed hedgerows often present with gaps, reducing their...
Conference Paper
Full-text available
Mangroves provide critical ecosystem services that support livelihoods and communities at the coastal margin. They are key natural flood defences to tropical cyclone driven storm surges, they store sediment that is vital for maintaining delta surface elevations in the face of rising sea levels, and transfer key nutrients to agricultural land. Over...

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