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1.
M. V. Mikhailova 《Water Resources》2010,37(2):160-171
The peculiarities of the hydrological regime of the Orinoco River and the coastal zone of the Atlantic Ocean that affect the
hydrological-morphological processes in the mouth area of the Orinoco River are considered. The major features of the delta
water regime, including its inundation, runoff distribution over the delta branches, water and sediment balance, and the processes
of river and sea water mixing are described. Special attention is paid to the morphological processes at the Orinoco mouth
(delta evolution and modern processes at its coastline). 相似文献
2.
The hydrological and morphological features of the Chao Phraya Mouth Area (Thailand) are considered. The attention is focused
on the assessment of the effect exerted on the hydrological and morphological processes in the delta and the nearshore of
the Chao Phraya River by a considerable anthropogenic drop in water and sediment runoff of the river; land subsidence near
Bangkok caused by groundwater withdrawal; sea level rise; and wave intensification. 相似文献
3.
The general geographic, hydrographic, climatic, and hydrological characteristics of the Congo R. basin are considered. The major features of the riverine and marine factors that have their effect on the hydrological regime and morphology of the delta and estuary of the Congo R. are identified; the effect of a submarine canyon on the morphological features of the estuary is analyzed in detail; and changes in river delta structure in the XX century and currently are considered. The hydrological—morphological characteristics of the largest mouths of African rivers, the formation conditions of water and sediment runoff, and variations of their deltas are compared. 相似文献
4.
The hydrological and morphological processes in the mouth area of the Upper Angara (which ranks second in terms of water abundance among Baikal Lake tributaries) are considered. The major external factors that determine those processes have been revealed. The main features of the delta??s water regime, including the effect of anthropogenic level rise in the lake, are described. Specific attention is paid to morphological processes in the delta and on the barrier bar, separating a large mouth lagoon from the lake. 相似文献
5.
The Niger River delta, one of the largest deltas of the world, is characterized in this article. The geographic features, including the delta hydrographic system, natural and territorial complexes, hydrological regime, and the dynamics of the coastline, are discussed. Special emphasis is given to the assessment of the impact of the following factors on the delta structure and regime: river flow regulation, tides, the ocean level rise, sea waves, natural and human-induced land subsidence. 相似文献
6.
Main features of sediment regime in the mouth area of the Hong Ha River (Red River), Vietnam, are discussed. As shown, the hydraulic engineering construction on the Da tributary resulted in a nearly two-fold decrease of river sediment yield. Sediment budget components at the river mouth were analyzed to establish that more than 90% of the sediment yield was detained in the delta branches and in the nearshore zone of the river mouth. Morphological processes in the Hong Ha River mouth area were characterized in detail including delta evolution during Holocene and the dynamics of its channel network, coastline, and mouth bars. Special attention was given to modern processes of delta progradation at the mouths of main branches and to wave erosion of other parts of the delta coastline. The causes for the intensification of this kind of erosion and change of the delta type in the late XX century are discussed. 相似文献
7.
The problem of assessment of sea level rise impact on the hydrological regime and morphological structure of river deltas
is discussed. Studies of the response of river deltas, which are among the most vulnerable natural objects, to the sea level
rise has become urgent because of the global climate warming and the associated acceleration of the World Ocean level rise.
Methods are described that can be used for the analysis, calculation, and prediction of sea level rise impact on submergence
of deltas, propagation of backwater from the sea tides, surges, and salt seawater intrusion. Special emphasis is given to
channel processes in delta branches, which accompany sea level rise, as well as to delta coastline erosion and flow redistribution
among branches. In the course of research, due consideration was taken of the experience gained in studying the response of
river deltas on the Caspian Sea coasts to the recent considerable level rise in this water body. 相似文献
8.
The hydrological regime, morphological structure, and landscapes of the Indus River delta are considered, and the significant changes that took place in them during the second half of the XX century because of the large-scale hydraulic engineering activity in the river’s basin, runoff regulation, and water withdrawal for irrigation are analyzed. It is shown that the abrupt decrease in water and sediment runoff in the Indus have affected the hydrological processes in the river’s lower reaches and caused delta degradation. 相似文献
9.
Hydrological and morphological processes in the Zhujiang River (Pearl River) mouth area of China are discussed. The hydrological regime of the Xijiang River, which is the largest river of South China and the main source of water inflow into the Zhujiang mouth area, is described. The basic features of the hydrological regime of the delta and the near-shore zone of the Zhujiang River mouth are characterized, much attention being given to the role of tides and mixing of river and sea water in the hydrological regime. Special emphasis is placed on morphodynamic processes at the mouth area and the history of the Zhujiang Delta evolution. 相似文献
10.
M. V. Mikhailova 《Water Resources》2008,35(2):137-155
The main hydrological and morphological features of the Columbia River mouth area, including its tidal estuary, are discussed. Close attention is given to the characteristics of large-scale hydraulic projects in the river basin as well as to dredging and channel training operations in the river mouth area and to the assessment of the impact of these operations on hydrological and morphological processes. Variations in the regime of river flow after its regulation, processes of dynamic interaction and mixing of river and sea water in the estuary are characterized. Changes of the mouth bar and sea coasts near the Columbia River mouth as a result of construction of stream-training jetties are discussed. 相似文献
11.
General information on the Nile River basin is presented. Specific features of the morphological regime of the Nile Delta and its near-shore zone, as well as the delta water balance and groundwater regime are discussed. The dynamics of the sea coastline of the Nile Delta is described in great detail. It is shown that the recent delta of the Nile and its sea coastline have been formed under the joint impact of the eustatic sea level rise, subsidence of sediments in the northern part of the deltaic plain, and considerable decrease in the river sediment runoff after the construction of the Aswan High Dam. 相似文献
12.
Specific features of the hydrological regime of the Rhône River and the nearshore zone of its mouth are discussed. The processes of seawater intrusion into the delta branches are described. The information on the history of the delta evolution and development is presented along with the reconstruction of the Holocene evolution of the Rhône Delta and analysis of formation peculiarities of the present-day delta. Channel processes in the Rhône Delta and the dynamics of the delta coastline are described; characteristics of the deep-water fan are discussed, and the data on sediment balance are given. 相似文献
13.
This article characterizes the atlas prepared at the Faculty of Geography, Moscow State University; 87 mouths of the largest
world rivers are presented in space images. The atlas has 325 pages, 95 maps, 425 images and six printer’s sheets of explanatory
text. The atlas is based on space images in the Internet galleries with data representation at different territorial levels
(river mouth area-delta, estuary or their complex-typical delta reaches). The atlas shows specific features of river mouth
areas, their hydrological and morphological structure, including estuaries and river deltas, their long-term and seasonal
dynamics, landscapes and delta land use, hydraulic structures in deltas, ports, cultural and historical monuments, as well
as recreation objects. 相似文献
14.
The peculiarities of the hydrological regime of the delta and near-shore zone of the Po River are discussed. The intrusion of salt seawater into the delta is described. The history of the Po Delta formation has been restored on the basis of the analysis of historical, archeological, and cartographic data. As shown, the peculiarities of hydrological and morphological processes in the Po River mouth are associated with natural and specifically with human-induced variations in sediment runoff of the river, with levee construction along branches, subsidence of deltaic deposits, and eustatic rise of the sea level. 相似文献
15.
The geographical and hydrological features of the Mekong River basin and the nearshore zone of the South China Sea, which
influence the hydrological regime of the Mekong River mouth, are discussed. Detailed characteristics are provided for the
drainage system of the Mekong River mouth area, water flow distribution among the delta branches, processes of the delta submergence
during floods, as well as propagation of tidal, surge-induced level fluctuations and seawater intrusion into the river. Regularities
of the Holocene evolution of the Mekong River mouth area and recent processes of delta formation are also discussed. 相似文献
16.
The main regularities of hydrological and hydrological-environmental processes occurring within the complex estuary, the Chesapeake Bay and the mouths of its tributaries, are discussed. The peculiarities of the estuary morphological structure, including the structures of tidal and net currents, salinity and water turbidity fields and their variability, the environmental conditions, and their human-induced changes. Using the Chesapeake Bay as an example, it became possible to reveal the basic features of classical estuaries subject to a considerable impact of river runoff and featuring mixing of river and sea water and moderate stratification of the water mass. It is shown that the regularities of hydrological processes in the Chesapeake Bay are typical of many mouth water bodies of estuarine type (inlets, drowned river valleys, lagoons, and tidal estuaries proper). 相似文献
17.
V. N. Mikhailov D. V. Magritsky V. I. Kravtsova M. V. Mikhailova M. V. Isupova 《Water Resources》2012,39(1):11-43
Regularities in the response of the mouths of major rivers, flowing into the Caspian Sea, to large-scale variations in its
level and river water runoff and sediment yield are considered. Changes in the morphological structure and hydrological regime
of the Volga, Terek, Sulak, Ural, and Kura mouths have been analyzed in both geological past and separately for three modern
periods: a considerable drop in Caspian Sea level before 1978, its abrupt rise in 1978–1995, and a relative stabilization
in the subsequent years. Specific features were identified in the hydrological-morphological processes in different mouths,
caused by the differences in river sediment yields, and the slopes of delta surface and mouth nearshore beds. Some theoretical
and methodological approaches were verified in the analysis and evaluation of the processes under consideration. The obtained
results of studies of the mouths of rivers flowing into the Caspian Sea can be regarded as examples and analogues in the assessment
of processes, which take place at the mouths of other Russian and world rivers at present and can take place in the future
under anticipated natural and anthropogenic variations in sea level and river runoff. 相似文献
18.
The main features of hydrological processes taking place in the mouth area of the Hong Ha River in Vietnam are considered.
The geographic and hydrological conditions in the Hong Ha River basin and in its receiving water body—the Gulf of Tonkin,
South China Sea—are briefly characterized. The main features of the mouth area of the Hong Ha River as a specific geographic
object are identified. The hydrological regime of the delta and the nearshore zone of the Hong Ha River are described in detail.
Water balance of the delta, runoff water levels and delta inundation, water and sediment runoff distributions over delta branches,
and the effect of tides, typhoons, and storm surges on delta regime are considered. Present-day problems of the use and protection
of natural resources at the Hong Ha River mouth are briefly discussed. 相似文献
19.
M. V. Mikhailova 《Water Resources》2009,36(1):26-42
Data on the Colville River mouth (Alaska, USA) are used to discuss the regularities in hydrological processes taking place in river mouth areas, functioning under extreme arctic conditions. Seasons and periods are recognized in the annual cycle of the Colville river mouth hydrologic regime. A thick ice cover commonly forms in winter in the river, its delta distributaries, and the offshore zone. Water salinity in under-ice water in the distributaries and near-delta river reach appreciably increases in late winter. The spring flood is very short; in this period, snowmelt water propagates toward the ocean first over ice and next under it. A wedge of freshened waters forms in the nearshore zone above fast ice. River runoff abruptly drops in the summer-autumn low-water period. The morphological processes in the distributaries and some ecological conditions in the delta are also discussed. 相似文献
20.
The evolution of the Ganges and Brahmaputra river delta during the Holocene period is discussed. Particular attention is given to the processes of delta formation, the dynamics of the delta hydrographic systems, the channel processes in river branches, as well as to the dynamics of the delta coastline and nearshore zone bed over the last 150–200 years. The calculation of sediment budget in the mouth area of these rivers is presented. 相似文献