Geography Reference
In-Depth Information
Spatial-Temporal Evolution of the Unique
Preserved Meandering System in Central
Europe
Jakub Miˇijovsk´ and Monika ˇ ulc-Michalkov ´
Introduction
The channels of alluvial lowland rivers are formed by the action of flowing water on
materials that have been deposited by the stream and that can be eroded and
transported. The major factors that affect the forms of an alluvial channel include
water discharge, sediment characteristics, longitudinal slope, resistance of the bank
and bed to erosion, vegetation, geology and human activity. According to Holubov ´
et al. ( 2005 ), meandering rivers can be classified as either stable (passive) or
actively meandering (active). An actively meandering river has sufficient stream
power to deform its channel bends through active bed and bank erosion and the
growth of point bars. The result of fluvial processes in a lowland region is an
actively meandering river reach. Meanders evolve and respond to floods that have
sufficient stream power to mobilise bed and bank sediments. Conversely, a stable
meandering (passive) river is one that has insufficient stream power to erode its
banks under current conditions.
The objectives of this study are to describe and understand the evolution of
lowland meandering streams using the case of the Morava River, a natural
meandering river that was modified by the regulation and restoration of oxbow
lakes, and to describe the process of cutoff using UAV (Unmanned Aerial Vehicles)
technologies. The study area is often suffer from floods. Correct understanding of
the development of the river can help protect the surrounding built-up areas.
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