Runoff regime changes in German rivers due to climate change
Climatic change ; Germany ; Hydraulic works ; Hydrological regime ; Precipitation ; River regime ; Seasonal variability ; Stream ; Stream flow ; The 2000's ; Twentieth Century
This study systematically analyses gauge data of large rivers in Germany in order to identify changes in the runoff regime, mainly caused by climate change since middle of the 20th century. It is shown that the general runoff regime types
Hillslopes, rivers, plows, and trucks : mass transport on Earth's surface by natural and technological processes
Most of the world's mass-action is generated by the motion of fluids of global or continental extent, as in atmospheric circulation or river flow. Technological mass-action exceeds that of all land-based geomorphic systems except rivers
Chaotic characters of the Yellow River Basin based on the sediment time series : an attempt to integrated research in geography
Sediment contents from 1952 to 2007 on Toudaoguai, Tongguan, Huayuankou and Lijin sections along the river are chosen as the study time series, and correlation dimensions (D2), Kolmogorov entropies (K2), and Hurst indexes (H) of the time series were
calculated. The results are discussed in an attempt to provide an integrated research method for geographical science. Eight state variables and two control parameters are necessary to construct the dynamic model of the Yellow River Basin system.
The distribution and residence time of suspended sediment stored within the channel margins of a gravel-bed bedrock river
Previously undocumented deposits are described that store suspended sediment in gravel-bedded rivers, termed ‘fine-grained channel margin’ (FGCM) deposits. They consist of sand, silt, clay, and organic matter that accumulate behind large woody
debris (LWD) along the margins of the wetted perimeter of the single-thread, gravel-bed South River in Virginia. The distribution of ages in these deposits can be fitted by a power function, suggesting that sediment stored in the deposits has a wide
variety of transit times. The presence of FGCM deposits indicates that suspended sediment is not simply transported downstream in gravel-bed rivers in agricultural watersheds: significant storage can occur over decadal timescales. South River has a history
Diagnostic experiments for transport mechanisms of suspended sediment discharged from the Yellow River in the Bohai Sea
River, were conducted to separately diagnose effects of different hydrodynamic factors on transport of suspended sediment discharged from the Yellow River in the Bohai Sea.It could be concluded that suspended sediment discharged from the Yellow River
cannot be delivered in long distance under the condition of tidal current. Almost all of sediments from the Yellow River are deposited outside the delta under the condition of wind-driven current.
The influence of water regulation on vegetation in the lower Heihe River
Since 2000, great changes in spatial-temporal distribution of water resources took place in the lower Heihe River. In order to objectively evaluate the influence of water regulation on the eco-environment, the changes of groundwater table, typical
vegetation, landscape types as well as East Juyan Lake have been analyzed in the lower Heihe River, by means of field surveys and remote sensing. These results indicate that there are obvious effects of water regulation on the eco-environment, which has been
improved toward sustainability in the lower Heihe River.
2010
[b1] Yellow Rivers Inst. of Hydraulic Research, YRCC, Zhengzhou, Chine
Numerical modelling of climate change impacts on Saint-Lawrence River tributaries
Années 2010-2099 ; Canada ; Changement climatique ; Changement global ; Cours d'eau ; Dynamique fluviale ; Effet de serre ; Impact ; Modèle ; Niveau de base ; Québec ; Saint-Laurent ; Transport sédimentaire
The impacts of climate-induced changes in discharge and base level in 3 tributaries of the Saint-Lawrence River, Québec, are modelled for the period 2010–2099 using a one-dimensional morphodynamic model. Changes in channel stability and bed-material
delivery to the Saint-Lawrence River over this period are simulated for all combinations of 7 tributary hydrological regimes (present-day and those predicted using 3 global climate models and 2 greenhouse gas emission scenarios) and 3 scenarios of how
the base level provided by the Saint-Lawrence River will alter (no change, gradual fall, step fall). The different results highlight the importance of investigating several rivers using several climate models in order to determine trends in climate change
Effect of reservoir construction on suspended sediment load in a large river system : thresholds and complex response
Based on hydrometric data in the upper Changjiang River basin, the change in behaviour of sediment transport of some dammed rivers was studied. As a result, some phenomena of threshold and complex response were found. The impacts of reservoir
concentration (SSC) increases and reaches a maximum, and then declines sharply. This phenomenon was found on the main-stem and several major tributaries of the upper Changjiang River. In the Minjiang River, where a series of dams were built successively
Stratigraphy and chronology of Late Quaternary floodplain sediments in a historic mining area, Vils River valley, East Bavaria, Germany
sequence of the Vils River floodplain is built of 5 units representing facies of different genesis (rock/saprolite, gravel, sand, loam, peat) that are identified by physical, chemical, and mineralogical parameters (grain size, clast shape, and content, TOC
, bulk mineralogy). Along the valley, different units/facies are found at the Upper Vils River and at the Lower Vils River. Age determinations show increasing accumulation of flood loam in the last millennium. The data correlate with the beginning
of mining at the Vils River and hence suggest a causal connection with mining activities in the catchment (both on the slopes and in the floodplain) with intense deposition of flood loams.
The chemistry of major cations and anions in the water of Lake Pumayum Co and its inflow river was studied, revealing the obvious ionic difference among various inflow rivers and the lake. With the evidence of distribution of water chemistry
and oxygen isotope of lake water, a conclusion can be outlined that Jiaqu River had a distinct effect on the hydrochemistry of the water on the submerged delta, whereas this is not the case for other rivers. The Gibbs plot revealed that the dominant mechanism
responsible for controlling chemical compositions of the lake water was rocks weathering in the drainage area. The different hydrochemistry characteristics between river water and lake water may result from the CaCO3 precipitation. The findings will benefit
Distribution of soil organic carbon under different vegetation zones in the Ili River Valley, Xinjiang
on, in the Ili River valley, Xinjiang, according to data from field investigations and laboratory analyses in 2008 and 2009. The study results show that the soil organic carbon content in the Ili River valley varies with the type of vegetation. The AA. pay
special attention to the characteristics of soil organic carbon in the meadow ecosystem in the Ili River valley, so as to lay a foundation for further studies on a regional-scale soil carbon cycle.
Variation and abrupt change of climate in Ili River Basin, Xinjiang
In this paper, the monthly precipitation and temperature data collected at 7 stations in the Ili River Basin from 1961 to 2007 were analyzed by means of simple regression analysis, running mean, db6 wavelet function and Mann-Kendall test. This study
revealed the characteristics of climate change and abrupt change points of precipitation and temperature during different time scales in the Ili River Basin within the past 50 years. The results of the study can be used as the climate change model
for reasonable development and utilization of water and land resources in the Ili River Basin.
Tide-modulated hyperpycnal flows off the Huanghe (Yellow River) mouth, China
The paper describes hyperpycnal flows observed in situ off the Huanghe (Yellow River) mouth, their relationship to tidal cycles, and the mechanisms that drive them. Simultaneous observations at six mooring stations during a cruise off the Huanghe
mouth in the flood season of 1995 suggest that hyperpycnal flows observed at the river mouth are initiated by high concentrations of sediment input from river and modulated by tides. Hyperpycnal flows started near the end of ebb tides, when near-bottom
Wetland construction and distribution in the Lhasa river basin were analyzed based on multi-source data including field investigation data, CBERS remote sensing data and other thematic data provided by 3S technology. The wetlands are mainly
Rainfall, runoff and sediment transport relations in a mesoscale mountainous catchment : the River Isábena (Ebro basin)
The aim of this paper is to investigate the rainfall–runoff–sediment transport relations and to assess the linearity of the hydrological and sedimentary response of the Isábena river basin, a highly dynamic Mediterranean mountainous catchment
Mexican urban colonias in the Salt River Valley of Arizona
atmosphère rurale, étaient connectées au processus d'urbanisation d'avant 1940 dans la Vallée de la Salt River. Les AA. donnent des précisions sur la diversité et la dispersion de ces habitats, processus engendrés par l'agriculture industrielle, la
Ecological survey of river habitat diversity : trans-boundary cooperation in the Ore Mountains (Krušné hory, Erzgebirge)
Results of a trans-boundary ecological survey of the cross-border Rolava and Weisseritz river catchments in the Erzgebirge / Krušné hory are presented. An optimized method to assess the ecohydrological status of streams in keeping with the European
Since the second half of the 19th century boulders of large size and of exotic rock quality have been recovered from Pleistocene gravel deposits in various locations: along the Danube River between Győr and Délegyháza (Hungary) and from alluvial
fans in the northern, western and south-eastern foreland of the Mátra Mountains and from alluvial fans of the Sajó and Hernád Rivers as well as probably of the Maros River. The distribution of boulders and their deposition pattern point to fluvial