NDLI: Driving factors of short-term channel changes in a semi-arid area (Sahand Mountain, northwestern Iran)

Content Provider	Springer Nature Link
Author	Khaleghi, Somaiyeh Surian, Nicola Roostaei, Shahram Khorshiddoust, Ali Mohammad
Copyright Year	2015
Abstract	Rivers change through time in response to upstream and downstream controls and may change over very short time periods (i.e., few years), in particular when human impact affects fluvial systems. In the Lighvan River catchment, a semi-arid mountainous area in northwestern Iran, remarkable changes in the fluvial environment and channel morphology have taken place over the last few years. The aim of this paper is to explain driving factors of channel changes along the Lighvan River, in a 16-km-long reach, over the period 2000–2012. Data and methods used include maps and field survey to quantify channel changes; analysis of hydrological data (precipitation and discharges); Landsat images for land-use classification and then evaluation of possible changes in flood peak discharge by SCS method; and calculation of unit stream power changes. In general, the channel underwent incision (up to 1 m) and narrowing (up to 18 m), although aggradation occurred in few cross sections in the upstream part of the study reach and widening in few cross sections in the downstream part. Investigation of causes of these changes showed that magnitude of annual peak discharges increased over the period 1991–2012, and it can be suggested that such increase is related to natural causes (i.e., increase of precipitation) and human impact so that both human and natural factors had a role in the recent evolution of the Lighvan River. Channelization and increase of peak discharges (due to an increase of precipitation and land-use changes) have been the main drivers of channel evolution.
Starting Page	6625
Ending Page	6637
Page Count	13
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	74
Issue Number	9
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-07-02
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Channel morphology Incision Narrowing Human impact Lighvan River Geology Hydrology/Water Resources Geochemistry Environmental Science and Engineering Terrestrial Pollution Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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