报告题目：Alluvial Rivers crossing the Gangetic Plains

报 告 人：Alistair G.L. Borthwick  教授

邀 请 人：曹志先  教授

时     间：2024年12月6日（星期五）下午3:00

地     点：水资源国重大楼B区109报告厅

报告人简介：

Alistair Borthwick has more than 45 years’ experience in engineering science, and first visited Wuhan University in 1990. He is an Emeritus Fellow of St Edmund Hall Oxford, Emeritus Professor at The University of Edinburgh, and Professor of Applied Hydrodynamics at the University of Plymouth. He was previously a Professor of Engineering Science at the University of Oxford where he worked from 1990 to 2011 and was Head of Civil & Environmental Engineering at University College Cork from 2011-13. His research interests include river, coastal, and ocean engineering, and marine renewable energy. He was awarded an honorary degree by Budapest University of Technology and Economics in 2016, the Gold Medal from the Institution of Civil Engineers in 2019, and the YanYuan Friendship Award by Peking University in 2020. He is a Fellow of the Royal Academy of Engineering UK, and a Fellow of the Royal Society of Edinburgh.

报告简介：

The large Himalayan river system of the Gangetic Plains supports 10% of the world’s population and is home to some of the world’s poorest and most densely populated communities. The Gangetic Plains comprise steep gravelly river channels that transition abruptly to low gradient sandy channels 10-40 km downstream of the mountain front. The first part of the lecture will combine sedimentological analysis with entrainment calculations to demonstrate that hyper-concentration under intense monsoon precipitation is required to transport coarse bedload over the low-gradient Gangetic plains. The second part will examine the Karnali River as it flows through the Terai River in west Nepal and demonstrate the need for field measurements at morphologically sensitive sites following large sediment-generating events to improve model inputs in future flood prediction models. The third part will consider how variations in sediment supply, grain size distribution, and climate change affect channel morphology and flood inundation in the Nakkhu River, Kathmandu, Nepal.

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