Medium Term Fluvial Island Evolution In
Relation With Flood Events In The Piave River
Author(s)
L. Picco, L. Mao, E. Rigon, J. Moretto, D. Ravazzolo,
F. Delai & M. A. Lenzi
Abstract
River islands could be defined as discrete areas of woodland vegetation
surrounded by either water-filled channels or exposed gravel which exhibits
some stability, and remain exposed during bunk-full flows. Islands are important
from morphological, functional, and ecological points of view. The aim of the
present study is to analyze the dynamics of stable, young and pioneer islands in
the Piave River, which suffered intense and multiple human impacts especially
due to dam building and in-channel gravel mining. Plan-form changes of river
features from 1960 were analyzed using aerial photos, and a LiDAR was used to
derive the maximum, minimum and mean elevation of island surfaces and the
maximum and mean height of the island vegetation. The results suggest that
stable islands lie at higher elevation than young and pioneer islands, and are
characterized by a thicker layer of fine sediments deposited on their surfaces
after big floods. There was a progressive decrease in the active corridor area
from 1960 to 2006. After the 1966 exceptional flood (RI> 200 years) there was a
moderate increase of island extend and numbers, followed by a further increase
from 1991, due to a succession of flood events, in 1993 and 2002 with RI> 10
years, as well as a change in the anthropic management characterized by a
control relating to mining activities. The narrowing trend (1960-1999) of the
morphological plan-form, certainly enhanced the chance of the island to become
stable and this explains the reduction of active channel, the increase of stable
island and the reduction of pioneer island. Even though a general channel
Keywords
river islands, gravel bed rivers, floods, Piave River, Italy
Related Book
Other papers in this volume
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