A three-dimensional wave radiation stress is introduced into the hydrodynamic sediment coupled model COHERENS-SED, which has been developed through introducing wave-enhanced bottom shear stress, wave dependent surface...A three-dimensional wave radiation stress is introduced into the hydrodynamic sediment coupled model COHERENS-SED, which has been developed through introducing wave-enhanced bottom shear stress, wave dependent surface drag coefficient, wave-induced surface mixing, SWAN, damping function of sediment on turbulence, sediment model and depth-dependent wave radiation stress to COHERENS. The COHERENS-SED is adopted to study the effects induced by wave-induced three-dimensional longshore current on suspended sediment spreading of the Huanghe River （Yellow River） mouth. Several different cases divided by setting different wave parameters of inputting boundary waves are carried out. The modeling results agree with measurement data. In terms of simulation results, it is easy to know that three-dimensional wave radiation stress plays an obvious role when inputting boundary wave height is stronger than 3 m. Moreover, wave direction also affects the sediment spreading rules of the mouth strongly too.展开更多
By using satellite remote sensing informations, the conceptual system of time-space at tributes and time dimension in recent evolution of the sand spit at the Huanghe River mouth is expound ed. Based on this work, the...By using satellite remote sensing informations, the conceptual system of time-space at tributes and time dimension in recent evolution of the sand spit at the Huanghe River mouth is expound ed. Based on this work, the parameterization of relevant factors and topological analysis of sand spit spa tial structure are conducted, and a model, which is suitable for representing the development and growth of the Huanghe River mouth is developed. It is shown that during the later stage of its development, the Sand spit growth index is almost 0. According to the parallelogram rule, under the reinforce effects of the Coriolis force and ocean dynamics, the Sand spit of current stream will never extend towards sea when it reaches the deep-water area. This work would be helpful to the imminent comprehensive harness of the 'man-made river branch' at the Huanghe River mouth.展开更多
On the basis of the bathymetric records of 371 survey sections in the present Huanghe mouth area from 1996 to 2001, the temporal and spatial variations of the Huanghe mouth bars were studied by using GIS technology. T...On the basis of the bathymetric records of 371 survey sections in the present Huanghe mouth area from 1996 to 2001, the temporal and spatial variations of the Huanghe mouth bars were studied by using GIS technology. The variation of the mouth bars is closely related to the water and sediment discharges from the Huanghe River to the sea that has been decreasing drastically in recent years, and to coastal hydrodynamic regimes. The characteristics of the mouth bars are unique in contrast with those of other estuaries in the world. (1) The mouth bars of the Huanghe River consist of many small sandbars. Usually the sandbars are of ellipse-shape with the long axis of about 1~6 km, and short axis of about 1~4 km. The long axis is parallel to the principal direction of tidal current, and the short axis is variable, depending on the local dynamics. The crest of the sandbars is only about 0.4 m below the water surface at low tide. They are distributed within an area of 20 km2, not far from the river mouth area. The present mouth bars are in small-medium size, quite different from the large one formed during the 1970s and 1980s, when the river sediment discharge was several times larger than that after 1996. (2) The scale of a river mouth bar is related to the river discharge of that year. In 1997 sediment discharge from the Huanghe River was 42 Mt, and the mouth bar consisted of several small scattered sandbars. In 1998 the size of mouth bars was much larger than that in 1997, as the sediment discharge from the Huanghe River increased to 363 Mt. Variation of the mouth bars largely depends on the sediment discharge with a correlation coefficient of 0.78. The calculation of the volume of the mouth bar area shows that about 30%~40% of the river's into-sea sediment is deposited in the mouth bar area. (3) Compared with other large estuaries in the world, the Huanghe mouth bars have three unique features in responding to its high sediment concentration: small size, steep slope gradient and shallow crest depth.展开更多
From 1979 to 1989, the current Qingshuigou course of the Huanghe River formed a sub - delta which resembles a beak extending into the Laizhou Bay. It covers 618 km2 in area. To meet the needs of developing and constru...From 1979 to 1989, the current Qingshuigou course of the Huanghe River formed a sub - delta which resembles a beak extending into the Laizhou Bay. It covers 618 km2 in area. To meet the needs of developing and constructing the Huanghe River Delta and under the presupposition of keeping the current course for 15-20 a, we forecast mainly by using the OM (1, 1) model that the front border of the sub-delta will be close to 119°30'E and its area will become 923 km2by the end of the year 2000. The Huanghe River will make land 760 km2 in area.展开更多
A 3-D Finite-Volume Coastal Ocean Model was applied in the Bohai Sea,especially near the Yellow River estuary, to simulate the tides, tidal currents, residualcurrents and shear fronts, using unstructured triangular gr...A 3-D Finite-Volume Coastal Ocean Model was applied in the Bohai Sea,especially near the Yellow River estuary, to simulate the tides, tidal currents, residualcurrents and shear fronts, using unstructured triangular grids. In the case of anaccurate simulation of the tides and tidal currents in the Bohai Sea, this article focuseson the Yellow River mouth. The type of tides is irregular semi-diurnal and the type oftidal currents is the reciprocating flow, mostly parallel to the coastline. The tide inducedeulerian residual currents are a couple of eddies on each side of the river mouth, withthe anticlockwise on the left side and clockwise on the other side, and both of theeddies are enhanced by the Yellow River runoff. Two patterns of shear fronts areidentified at the conversion between the flood and ebb tidal phase. The results suggestthat the shear fronts be generated in the shallow water because the tidal phase of thecoastal area is ahead of the deeper seaward area, then moves seaward and finallydisappears 1-2 hours later.展开更多
Freshwater plume represents a key passage for the river to deliver sediment to the coastal ocean. A wa- ter-sediment regulation scheme was implemented for the Huanghe River in 2005; in order to examine the effect of s...Freshwater plume represents a key passage for the river to deliver sediment to the coastal ocean. A wa- ter-sediment regulation scheme was implemented for the Huanghe River in 2005; in order to examine the effect of such an activity on the river plume dynamics, three cruises were carried out off the Huanghe River mouth. The prelimi- nary results of the in-situ measurements suggested that the plume pathway shifted rapidly during the period of less than twenty days, which was confirmed by satellite remote sensing data in the same period. The rapid shifts were resulted from intensive interactions between river discharge and the vary- ing bathymetry in the river mouth area. A large amount of river sediment was delivered to the coastal region during this period and mostly deposited in the mouth bar area due to jet-flow deceleration, forming a cluster of mouth bars across the river mouth, which caused the rapid shifts of the plume pathway.展开更多
基金The Natural Science Foundation Study on Mechanics of Non-breaking wave-induced vertical mixing on Pollutant Dispersion of Huanghe River Estuary under contract No.51179178Project from Establishment of Fine Sediment Transport Modeling System for the Yellow Sea+1 种基金which is a sub-project of Development of Operational Oceanographic systemScience & Technology Development Project of Qingdao under contract No.09-1-3-18-jch
文摘A three-dimensional wave radiation stress is introduced into the hydrodynamic sediment coupled model COHERENS-SED, which has been developed through introducing wave-enhanced bottom shear stress, wave dependent surface drag coefficient, wave-induced surface mixing, SWAN, damping function of sediment on turbulence, sediment model and depth-dependent wave radiation stress to COHERENS. The COHERENS-SED is adopted to study the effects induced by wave-induced three-dimensional longshore current on suspended sediment spreading of the Huanghe River （Yellow River） mouth. Several different cases divided by setting different wave parameters of inputting boundary waves are carried out. The modeling results agree with measurement data. In terms of simulation results, it is easy to know that three-dimensional wave radiation stress plays an obvious role when inputting boundary wave height is stronger than 3 m. Moreover, wave direction also affects the sediment spreading rules of the mouth strongly too.
基金National Natural Science Foundation of China ! 49871056.
文摘By using satellite remote sensing informations, the conceptual system of time-space at tributes and time dimension in recent evolution of the sand spit at the Huanghe River mouth is expound ed. Based on this work, the parameterization of relevant factors and topological analysis of sand spit spa tial structure are conducted, and a model, which is suitable for representing the development and growth of the Huanghe River mouth is developed. It is shown that during the later stage of its development, the Sand spit growth index is almost 0. According to the parallelogram rule, under the reinforce effects of the Coriolis force and ocean dynamics, the Sand spit of current stream will never extend towards sea when it reaches the deep-water area. This work would be helpful to the imminent comprehensive harness of the 'man-made river branch' at the Huanghe River mouth.
基金supported by the National Natural Science Foundation Key Project of China under Contract No.90211022“973”Project of MST of China under contract No.2002CB412404.
文摘On the basis of the bathymetric records of 371 survey sections in the present Huanghe mouth area from 1996 to 2001, the temporal and spatial variations of the Huanghe mouth bars were studied by using GIS technology. The variation of the mouth bars is closely related to the water and sediment discharges from the Huanghe River to the sea that has been decreasing drastically in recent years, and to coastal hydrodynamic regimes. The characteristics of the mouth bars are unique in contrast with those of other estuaries in the world. (1) The mouth bars of the Huanghe River consist of many small sandbars. Usually the sandbars are of ellipse-shape with the long axis of about 1~6 km, and short axis of about 1~4 km. The long axis is parallel to the principal direction of tidal current, and the short axis is variable, depending on the local dynamics. The crest of the sandbars is only about 0.4 m below the water surface at low tide. They are distributed within an area of 20 km2, not far from the river mouth area. The present mouth bars are in small-medium size, quite different from the large one formed during the 1970s and 1980s, when the river sediment discharge was several times larger than that after 1996. (2) The scale of a river mouth bar is related to the river discharge of that year. In 1997 sediment discharge from the Huanghe River was 42 Mt, and the mouth bar consisted of several small scattered sandbars. In 1998 the size of mouth bars was much larger than that in 1997, as the sediment discharge from the Huanghe River increased to 363 Mt. Variation of the mouth bars largely depends on the sediment discharge with a correlation coefficient of 0.78. The calculation of the volume of the mouth bar area shows that about 30%~40% of the river's into-sea sediment is deposited in the mouth bar area. (3) Compared with other large estuaries in the world, the Huanghe mouth bars have three unique features in responding to its high sediment concentration: small size, steep slope gradient and shallow crest depth.
文摘From 1979 to 1989, the current Qingshuigou course of the Huanghe River formed a sub - delta which resembles a beak extending into the Laizhou Bay. It covers 618 km2 in area. To meet the needs of developing and constructing the Huanghe River Delta and under the presupposition of keeping the current course for 15-20 a, we forecast mainly by using the OM (1, 1) model that the front border of the sub-delta will be close to 119°30'E and its area will become 923 km2by the end of the year 2000. The Huanghe River will make land 760 km2 in area.
基金supported by National Key Technology Research and Development Program of the Ministry of Science and Technology of China (2014BAB12B02)Key Technologies Research and Development Program of Tianjin (14ZCZDSF00012)
文摘A 3-D Finite-Volume Coastal Ocean Model was applied in the Bohai Sea,especially near the Yellow River estuary, to simulate the tides, tidal currents, residualcurrents and shear fronts, using unstructured triangular grids. In the case of anaccurate simulation of the tides and tidal currents in the Bohai Sea, this article focuseson the Yellow River mouth. The type of tides is irregular semi-diurnal and the type oftidal currents is the reciprocating flow, mostly parallel to the coastline. The tide inducedeulerian residual currents are a couple of eddies on each side of the river mouth, withthe anticlockwise on the left side and clockwise on the other side, and both of theeddies are enhanced by the Yellow River runoff. Two patterns of shear fronts areidentified at the conversion between the flood and ebb tidal phase. The results suggestthat the shear fronts be generated in the shallow water because the tidal phase of thecoastal area is ahead of the deeper seaward area, then moves seaward and finallydisappears 1-2 hours later.
基金supported by the Ministry of Science an d Technology(Grant No.2002CB412404)Nationa1 Natura1 Science Foundation of China(Grant No.403060081.
文摘Freshwater plume represents a key passage for the river to deliver sediment to the coastal ocean. A wa- ter-sediment regulation scheme was implemented for the Huanghe River in 2005; in order to examine the effect of such an activity on the river plume dynamics, three cruises were carried out off the Huanghe River mouth. The prelimi- nary results of the in-situ measurements suggested that the plume pathway shifted rapidly during the period of less than twenty days, which was confirmed by satellite remote sensing data in the same period. The rapid shifts were resulted from intensive interactions between river discharge and the vary- ing bathymetry in the river mouth area. A large amount of river sediment was delivered to the coastal region during this period and mostly deposited in the mouth bar area due to jet-flow deceleration, forming a cluster of mouth bars across the river mouth, which caused the rapid shifts of the plume pathway.
