Measuring bedload in gravel-bed mountain rivers : averaging methods and sampling strategies
A dataset of more than 1,000 individual bedload samples coupled with hydraulic flow variables (water depth and velocity) was collected on 2 high mountain rivers the torrent de Saint Pierre, a proglacial gravel-bed river in the French Alps, in July
2002 and the Urumqi River, in the Chinese Tianshan mountains during summer 2005 and 2006. Analysis of the dataset leads to question the usual section averaged sampling procedure of bedload using Helley-Smith type bedload sampler. It is shown
Carrying capacity ; Channel geometry ; Dam ; Ebro ; Flood ; Hydraulic works ; Impact ; River bed ; Sediment load ; Spain ; Stream
The mobility of river-bed surface particles is examined in the lower Ebro River downstream from dams that were closed several decades ago. Mobility is analysed by comparing photographs of painted bed areas taken before and after the 2003-2004 flood
Temporal and spatial evolution of the coastal profiles along the Yellow River Delta over last three decades
processes that are responsible for the observed changes. The results demonstrated that the Yellow River Delta has recently been dominated by recession process due to the reduced sediment supply from the Yellow River in the recent decades. A critical
threshold of river sediment discharge was formulated and used to explain the observed morphodynamic processes in the area near abandoned delta, the estuarine area, and Laizhou Bay.
Very-high-resolution mapping of river-immersed topography by remote sensing
Alps (The) ; Bathymetry ; France ; Photogrammetry ; Remote sensing ; Research technique ; River bed ; Stream ; Topography
The remote sensing techniques used for river bathymetry are reviewed. They can be divided into 2 types : active remote sensing, such as ground penetrating radar and bathymetric lidar; or passive remote sensing, such as through-water photogrammetry
and radiometric models. This last technique, which consists of finding a logarithmic relationship between river depth and image values, appears to be the most used, lidar is an emerging technique. For each depth measurement method, the AA. detail the physical
principles and then a review of the results obtained in the field. This review shows a lack of data for very shallow rivers, where a very high spatial resolution is needed. Hence the AA. propose an application of 2 techniques, radiometric models and through
river bottom. In contrast, with through-water photogrammetry, fine ground resolution and bottom textures are necessary.
Vegetation succession and soil cover transformation after extreme flood : a case study from the Sázava River floodplain
The goal of this study was to assess impact of flood on soil and vegetation cover in the Sázava river floodplain after an extreme spring flood in 2006.There was a significant difference in species' composition between eroded sites and sites on thick
The paper presents fragments of the research held between 2005 and 2008 among secondary school students from 11 towns located on the Vistula River. The subject of the research was their perception of the River. Tested were: pupils’ associations
with and knowledge about the river, as well as their awareness of its ecological and cultural value. The results allowed for conclusions related to school geographical education, defined as “education towards values”. - (BJ)
Assessment of the river habitat quality within European Water Framework Directive : application to different catchments in Czechia
The paper presents the method of ecomorphological assessment of river habitat quality EcoRivHab, based on field mapping with possible usage of distance data. Overall ecohydrological state is evaluated by five degrees (ES I-V), characterizing
Hyporheic flow as a potential geomorphic agent in the evolution of channel morphology in a gravel-bed river
) and channel erosion (bank erosion) appeared to contribute to the formation of the head-cut gullies. Hyporheic flow is an important component in the geomorphic evolution of channels and the floodplain in a gravel-bed river.
Peat bogs influence on runoff process : case study of the Vydra and Křemelná River basins in the Bohemian Forest, southwestern Czechia
Bohemia ; Czech Republic ; Drought ; Flood ; Forest ; Impact ; Peat bog ; River basin ; Runoff ; Water resources
Specific part of wide complex of preventive measures against floods and extreme droughts could be procedures realized in river headstream areas. In order to increase a water retention in headwaters the detailed analysis of peat bogs hydrological
Border dispute between Croatia and Slovenia along the lower reaches of the Dragonja River
The paper discusses border dispute between Croatia and Slovenia along the lower reaches of the Dragonja River, acute since the two countries gained independence in 1991. It is the most hotly contested border dispute point between the two countries
except for the maritime border in Bay of Piran. The area with small villages of Mlini-Škrile, Bužini and Škodelin is known in the literature as the “area along the Dragonja River”, the area of double records or the case of four villages. The paper begins
A catchment-scale assessment of anabranching in the 143 000 km2 Fitzroy River catchment, north-eastern Australia
In this study of the Fitzroy River catchment, the AA. investigate whether an analysis of easily available remotely sensed and DEM data can provide useful information about the occurrence and the styles of anabranching. They present an initial
analysis of anabranching in the Fitzroy River using maps and satellite imagery, in which 3 distinct anabranching morphologies that occur in different regions of the catchment are described. This is then followed by a catchment-scale analysis of all channels
A field experiment on the development of sedimentary structures in a gravel-bed river
Canada ; Experimentation ; Gravel ; Quebec ; River bed ; Sediment transport ; Sedimentary structure ; Spatial distribution ; Stream
This paper aims to improve the understanding of the dynamics of sedimentary structures at the reach scale using a field approach. The AA. investigated the dynamics of sedimentary structures in three 15 m long reaches of a small gravel-bed river
Channel geometry ; Concept ; Equilibrium model ; Fluvial dynamics ; River bed ; River regime ; Stream
rivers. The paper focuses on the interpretation of how rivers adjust toward conditions that minimize change and maximize operational efficiency. Importantly, this study describes how iterative changes enable systems to achieve such a stable equilibrium.
Spatial prediction of river channel topography by kriging
California ; Forecast ; Geostatistics ; Krigeage ; Model ; River bed ; Stream ; Topography ; United States of America
Using survey data from a restored gravel-bed river, the AA. demonstrate how transformation to the channel-centered coordinate system facilitates interpretation of the variogram, a statistical model of reach-scale spatial structure used in kriging
A half-a-century record of annual energy expenditure and geomorphic effectiveness of the monsoon-fed Narmada River, central India
Carrying capacity ; Channel geometry ; Discharge ; Flood ; Gujarat ; India ; Interannual variability ; Madhya Pradesh ; Monsoon ; River bed ; Stream
This case study presents quantitative data on the magnitude and variability of specific power and total energy expenditure over a period of 51 years for the monsoon-dominated Narmada River, which produced an impressive flood in 1970. Specifically
to the main river (River Caldew). In the region enclosing this study, the River Caldew is one of 138 English rivers identified as at risk, and in 35% of cases this is due to sediment delivery. In all cases this risk status is determined without consideration
Channel incision, evolution and potential recovery in the Walla Walla and Tucannon River basins, northwestern USA
Accumulation rate ; Cross section ; Floodplain ; Fluvial erosion ; Lithology ; Model ; River bed ; Stream ; United States of America
The AA. evaluated controls on locations of channel incision, variation in channel evolution pathways and the time required to reconnect incised channels to their historical floodplains in the Walla Walla and Tucannon River basins. Controls
Precipitation cycles in the middle and lower reaches of the Yellow River (1736-2000)
Based on the long-term precipitation series with annual time resolution in the middle and lower reaches of the Yellow River and its 4 sub-regions during 1736-2000 reconstructed from the rainfall and snowfall archives of the Qing Dynasty
, the precipitation cycles are analyzed by wavelet analysis and the possible climate forcings, which drive the precipitation changes, are explored. The results show that : the precipitation in the middle and lower reaches of the Yellow River has inter-annual and inter
Temporal variation in downstream sediment transfer in the Lower Yellow River
An index of sediment transferring function (Fs) is applied in this study to reveal the temporal variation in the downstream sediment transfer of the Lower Yellow River. It is found that in the past 50 years, this sediment transferring function index
, the changing drainage basin factors have resulted in the decrease in the sediment transferring function of the Lower Yellow River.
Biogéographie ; Cartographie thématique ; Espèce invasive ; Labe River ; Tchèque république ; Végétation ripicole
The aim of this article is to summarize actual results of the field research of invasive neophytes' occurrence in the riverbank vegetation of the Labe River from Špindlerův Mlýn to Těchlovice (Děčín district). Results are presented for series