Streamflow and sediment transport from mountain watersheds of the ChaoPhraya basin, northern Thailand : a reconnaissance study
The A. disputes the hypothesis that land-use practices have altered the hydrologic regime of these basins or have contributed to an increased sediment load in the rivers. - (DWG)
Scales and power in river basin management : the ChaoPhrayaRiver in Thailand
Allocation ; Discourse ; Ecology ; Management ; Policy ; River basin ; Thailand ; Water resources
utilisant l'étude du cas du bassin fluvial de ChaoPhraya en Thaïlande. Etude des différents types d'interactions scalaires dans le bassin incluant celles d'aval (Bangkok) vers celles d'amont et d'autres bassins fluviaux.
Erosion and accretion processes in a muddy dissipative coast, the ChaoPhrayaRiver delta, Thailand
Seasonal variation in seabed elevation in the muddy intertidal zone of the ChaoPhrayaRiver delta was assessed using information on waves and tides predicted by numerical simulations. Observations, aimed at evaluating the effectiveness
The A. has investigated the micro-geomorphology of the area flooded by the ChaoPhrayariver, in the central plain of Thailand. The hydrological condition of the Chao Praya river which occurs throughout most of this plain has changed considerably
Années 1900 ; Bangkok ; ChaoPhrayariver ; Conditions de vie ; Développement ; Guide touristique ; Géographie historique ; Menam river ; Thaïlande ; Transport ; Urbanisation ; Vie quotidienne
Chaos and order. The channel geometry of gravel bed braided rivers in Geomorphological models. Theoretical and empirical aspects.
During their studies in Butramo basin, Calabria, the AA. became convinced that the braided rivers are not at all chaotic, but are extremely well regulated fluvial systems with an optimum efficiency in carrying both water and bed load.
This paper aims to illustrate the implications of one particular case study, in the Swiss Alps, for the understanding of the relationship between river channel form and process, and to raise some of the methodological issues associated with small
-scale site-specific research. 3 related themes are considered: the nature of the link between channel form and process revealed by intensive study of a dynamic river system; the significance of the conditional role of channel geomorphology in this link
Chaotic characters of the Yellow River Basin based on the sediment time series : an attempt to integrated research in geography
Années 1952-2007 ; Bassin-versant ; Chaos ; Chine ; Huanghe ; Hydrodynamique ; Système d'information géographique ; Série chronologique ; Transport sédimentaire
Chaos ; China ; Geographical information system ; Huang He ; Hydrodynamics ; Sediment transport ; Time series ; Watershed
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 complex nonlinear systems with fractal as well as chaotic dynamics of annual runoff processes in the three headwaters of the Tarim River
Années 1957-2002 ; Chaos ; Chine ; Cours d'eau ; Domaine aride ; Ecoulement fluvial ; Fractale ; Modèle ; Série chronologique ; Xinjiang
Arid area ; Chaos ; China ; Fractals ; Model ; Stream ; Stream flow ; Time series ; Xinjiang
This paper attempted to identify fractal and chaotic characteristics of the annual runoff processes in headwaters of the Tarim River. Methods of fractal analyses were used to explore several aspects of the temporal changes from 1957 to 2002
. The main findings are : 1) the annual runoff processes of the 3 headwaters of the Tarim River are complex nonlinear systems with fractal as well as chaotic dynamics; 2) the correlation dimensions of attractor derived from the time series of the annual
runoff for the Hotan, Yarkand and Aksu rivers imply that all 3 rivers are chaotic dynamical systems that are sensitive to initial conditions, and the dynamic modeling of their annual runoff processes requires at least 4 independent variables; 3) the time
series of annual runoff in each river presents a long-term correlation characteristic. The Hurst exponent for the period of 1989 to 2002 suggests that it is expected to see an increasing trend in the annual runoff of the Aksu and Yarkand rivers
in the years after 2002, but a decreasing tendency for the Hotan River in the same period.
Mutual optimization of water utilization structure and industrial structure in arid inland river basins of Northwest China
Based on the analysis of the interaction mechanism between water utilization structure and industrial structure in arid inland river basins of Northwest China, the AA. constructed a System Dynamic Model for their mutual optimization. It aims
system and a well-off living system for the whole river basin.
Long-term river meandering as a part of chaotic dynamics ? A contribution from mathematical modelling
Auto-organisation ; Chaos ; Cours d'eau ; Géométrie hydraulique ; Modèle ; Modèle mathématique ; Méandre ; Série chronologique
Channel geometry ; Chaos ; Mathematical model ; Meander ; Model ; Self-organizing behaviour ; Stream ; Time series
The AA. study the possible signatures of a chaotic behaviour or a self-organized criticality state triggered in river meandering dynamics by repeated occurrence of cutoff processes. The analysis is carried out examining, through some robust
obtained by using a suitable physics-based simulation model for river meandering. The results are consistent and show that, at least from a modelling point of view, no evidence of chaotic determinism or self-organized criticality is detectable
This research selected 2 irrigated areas of Heihui and Jiaokou in Guanzhong Plain, and 2 river valleys of Qianhe and Jinghe on the Loess Plateau of Weibei as the typical investigated and evaluated areas, and discussed heavy metals contents
When is a River not a River ? Consideration of the legal definition of a river for geomorphologists practising in New South Wales, Australia
Australia ; Concept ; Definition ; Environmental management ; Geomorphology ; Legislation ; New South Wales ; Perception ; River bed ; Stream ; Water resources
This paper examines why the definition of a river is an important and ongoing management issue, and outlines the development of legal definitions of river. Finally, the role of fluvial geomorphology is discussed with respect to the definition
of a river and its channel. This analysis will reveal whether the existing legislative framework adequately reflects the physical realities of rivers and watercourses so as to facilitate their conservation.
Sedimentatieverschijnselen nabij een rivier stuw op de Markrivier Sedimentation phenomena near a river dam on the river Mark
To alter the natural river behaviour, many regulation projects have been carried out on various river systems. However, until now very few studies on the reactions of the rivers to the imposed regulating systems have been undertaken. - (Author).
Channel geometry ; China ; Fluvial dynamics ; Fluvial processes ; Meander ; Model ; River bed ; Statistics ; Stream ; Stream flow
Since the anabranched river pattern is the most typical one in the middle and lower reaches of the Yangtze River (Changjiang) as well as in many other rivers in China, a systematic study on the formation cause of the anabranched river pattern has
been made in recent years, including field observations, modeling experiments in four river models under different boundary conditions, the analyses of river pattern formation and transformation etc. In this paper, some of the detailed results obtained
Some thermodynamic criteria for river channel changes
Fluvial dynamics ; Geosystem ; River bed ; Spatial variation ; Stream ; Stream flow
A theoretical model of river channel changes is presented, which shows some nonequilibrium thermodynamic criteria of a river channel to bedding and equilibrium.
Geometric properties of river cross sections and associated hydrodynamic implications in Wuhan-Jiujiang river reach, the Yangtze River
Based on measured hydrological data by using ship-mounted Acoustic Doppler Current Profiler (ADCP) instrument, the AA. analyzed shapes of river cross sections of the middle Yangtze River basin (mainly focusing on Makou and Tianjiazhen river reach
). The hydrologic data of 36 river cross sections have been successfully obtained. In this paper, the AA. try to characterize the hydrodynamic properties of river knots, associated backwater effects and their implications for flood mitigation in the middle and lower