Influence of tributaries on downstream bed sediment grain sizes under flysch conditions

作     者：SMAZAK Ivan GALLA Tomas SMA(Z)(A)K Ivan;GALIA Tomá(s)

作者机构：Department of Physical Geography and GeoecologyFaculty of ScienceUniversity of OstravaChittussiho 1071000 OstravaCzech Republic 

出 版 物：《Journal of Mountain Science》 (山地科学学报（英文）)

年 卷 期：2021年第18卷第4期

页      面：847-862页

核心收录：

学科分类：0709[理学-地质学] 081803[工学-地质工程] 07[理学] 08[工学] 0818[工学-地质资源与地质工程] 081501[工学-水文学及水资源] 0815[工学-水利工程] 

基　　金：supported by the University of Ostrava(Grant no.SGS02/P?F/2019–2020) 

主　　题：Tributary Bed sediments Headwater streams Flysch Carpathians 

摘      要：Tributaries are one of the most important factors contributing to variability in the downstream evolution of bed sediment grain *** primary aim of this work is to evaluate the response of the bed sediment texture in the recipient channel induced by ten tributaries of the?ernáOstravice stream and find reach-scale and catchment-scale parameters that would be able to predict this *** research was based on collecting information on the grain size distributions at sites adjacent to confluence zones.A significant change in sediment texture occurred in the vicinity of five *** the other factors contributing to grain size variability(e.g.,local channel geometry,lithology,and lateral sediment sources),it was assumed that only four of them were associated with a sufficient bedload influx to alter the sediment calibre below the ***,a significant morphological effect in the form of a large confluence bar was observed in one *** tributaries had several common features:(i)they had a larger relative catchment area than that of nonsignificant tributaries;(ii)they were characterized by different bed grain sizes,with some exceptions;and(iii)they had a higher unit stream power close to the confluence in relation to that of the *** characteristics were represented by the proposed relative parameters,including the relative unit stream power and bed material texture,which allowed the best classification of significant and nonsignificant *** their simplified form,the parameters described the transport capacity and grain size distribution,which were generally considered to be primary factors responsible for a redefinition of the sediment texture in the recipient ***,it should be noted that these results are subject to some degree of uncertainty due to the relatively small sample size of only 10 tributaries.