000189379 001__ 189379
000189379 005__ 20181203023253.0
000189379 0247_ $$2doi$$a10.1002/eco.1349
000189379 022__ $$a1936-0584
000189379 02470 $$2ISI$$a000322717300012
000189379 037__ $$aARTICLE
000189379 245__ $$aA case study on spatial and temporal hydraulic variability in an alpine gravel-bed stream based on the hydromorphological index of diversity
000189379 260__ $$aHoboken$$bJohn Wiley and Sons$$c2013
000189379 269__ $$a2013
000189379 300__ $$a16
000189379 336__ $$aJournal Articles
000189379 500__ $$a[931]
000189379 520__ $$aPhysical heterogeneity is a major topic in river sciences because it is known to be a key factor for ecological integrity. In this paper, we investigated the hydraulic enviroment in an alpine gravel-bed stream with an unaltered hydrological regime. The study was based on the hypothesis that spatial and temporal variability are correlated to the morphological template of a stream. Numerical hydrodynamic modelling was conducted at five morphologically contrasting study sites for different discharges chosen from discharge duration curves. On the basis of the resulting hydraulic variables, namely flow velocity and water depth, and of a recently proposed hydromorphological index of diversity, the differences in spatial and temporal variability were analysed by descriptive statistics. Spatial diversity was higher at morphologically natural sites than at sites that were partially or fully regulated by resectioning and bank protection. Conversely, temporal variability in the hydraulic environment was higher at regulated sites where hydraulic variables were subject to fluctuations with each small discharge modification, which is not the case for more impaired sites. Unless higher discharges with bed reshaping activity occur, natural streams are characterized not only by high spatial variability but also by a sustained persistence of aquatic habitats. Therefore, river engineering projects aimed at enhancing habitat heterogeneity should not only focus on a higher spatial variability of the physical environment but also aim for greater persistence of aquatic habitats. Copyright (C) 2013 John Wiley & Sons, Ltd.
000189379 6531_ $$ahydromorphologic units
000189379 6531_ $$ahydraulic variables
000189379 6531_ $$aspatial and temporal variability
000189379 6531_ $$anumerical modelling
000189379 6531_ $$aduration curves
000189379 700__ $$0242664$$aGostner, W.$$g128418$$uEcole Polytech Federale Lausanne EPFL, Lab Hydraul Construct LCH, Stn 18, CH-1015 Lausanne, Switzerland
000189379 700__ $$aParasiewicz, P.
000189379 700__ $$0241228$$aSchleiss, A. J.$$g112841$$uEcole Polytech Federale Lausanne EPFL, Lab Hydraul Construct LCH, Stn 18, CH-1015 Lausanne, Switzerland
000189379 773__ $$j6$$k4$$q652-667$$tEcohydrology
000189379 909C0 $$0252079$$pLCH$$xU10263
000189379 909C0 $$0255473$$pPL-LCH$$xU10263
000189379 909CO $$ooai:infoscience.tind.io:189379$$particle$$pENAC
000189379 917Z8 $$x206365
000189379 917Z8 $$x206365
000189379 937__ $$aEPFL-ARTICLE-189379
000189379 973__ $$aEPFL$$rREVIEWED$$sPUBLISHED
000189379 980__ $$aARTICLE