IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 35th IAHR Congress - Chengdu (2013) : THEME 5 - FLUVIAL HYDRAULICS AND RIVER MANAGEMENT : A preliminary study on Mechanism of Meander Cutoffs
A preliminary study on Mechanism of Meander Cutoffs
Author : Zhiwei Li, Zhaoyin Wang and Wenzhe Li
Neck cutoff is a sudden event of meandering rivers and reduces the sinuosity and complexity of meander morphology. Analyzing deeply patterns and mechanism of neck cutoffs is essential in this study. Distinguishing remote sensing images of neck cutoffs, they are divided into three different patterns (rush cutting, bank collapsing and erosion ditch), and theoretically investigating cutoff conditions, process and mechanism. Rush-cutting pattern is the most common way of neck cutoffs. The process of rush-cutting pattern is the overflow surface scouring, forming a new channel and intensively scouring the new channel until reaching the stabilization. Bank collapsing pattern occurs on extremely narrow neck where left and right banks collapsing simultaneously or unilateral bank collapsing cause downstream flow through the neck. Erosion ditch pattern is the first flood scouring forming a new ditch, and subsequent floods along the ditch scouring with the headward erosion until the new channel completely forming to accomplish the neck cutoff.
File Size : 671,325 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 35th IAHR Congress - Chengdu (2013)
Date Published : 18/07/2016
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