澜沧江水资源系统变化与大湄公河次区域合作的关联分析

针对澜沧江-湄公河水资源系统变化的跨境影响这一受到国际社会,特别是下游国关注的问题,结合流域各国水需求及区域性协定之规定,对比分析澜沧江大坝建设后对径流的影响,发现：（1）年出境水量呈小幅增长趋势,总体上有利于下游水资源利用;（2）个别年份枯季出境水量明显减少的主要原因是降水少和个别电站运行失误所致,电站本质上不会对下游用水和生态产生实质性危害;（3）出境水量变化主要对下游中上段产生明显影响,越往下游影响力越小;（4）出境水质稳定。建议：尽早制定流域综合规划和国际水分配方案;合理调整水库运行方案,避免出境水量或水位的大幅变化,减少跨境负面影响,维护区域合作。     

长江上游干支流悬移质含沙量的变化及其原因

河流含沙量的变化是流域自然与人文因子变化的反映。以长江上游干支流1956~2000年的水沙和降水资料为基础,运用时间系列分析和统计分析方法进行研究。研究发现,干流宜昌站和4条主要支流含沙量的变化不是同步的,4条主要支流含沙量的变化呈现出复杂变化图形。流域面平均年降水量的变化,仅能解释含沙量变化的15.86%~37.21%,说明气候因素的变化不是长江干支流含沙量变化的主要原因。运用双累积曲线分析方法,研究了人类活动 (如水库修建,交通、矿山和城市建设,水土保持,植被破坏和恢复等 )对含沙量变化的影响。人类活动影响在不同的流域有较大差异。与4条主要支流相比,长江干流宜昌站含沙量的变化较小,反映了尺度效应的影响。多元回归分析表明,屏山 、高场、北碚、武隆4站的年均含沙量变化对宜昌站年均含沙量变化的贡献率分别为28.5%、12.6%、44.2%和14.7%。     

Fluvial processes of the downstream reaches of the reservoirs in the Lower Yellow River

Evolution of the river channel downstream of reservoirs is a complex process that is closely related to the operational mode of the reservoirs and the channel boundary conditions. Numerous studies have been carried out on the fluvial processes of downstream reservoirs. However, only a few of them have focused on the relationship between runoff-sediment conditions and channel pattern indicators. Also, the impacts of river training works on fluvial processes are seldom dealt with. In this paper, the evolutionary processes of three sections in the Lower Yellow River, including Tiexie-Yiluo River mouth reach, Huayuankou-Heigangkou reach and Jiahetan-Gaocun reach, were analyzed for variations in the channel boundary line and the mainstream between 1960 and 2015. Channel pattern indicators such as sinuosity, mainstream wandering range and width/depth ratio were analyzed based on field measurements obtained by the Hydrological Department of the Yellow River Conservancy Commission. The effects of river training works on the channel evolution are then described. Since 1960, numerous medium- and large-sized reservoirs have been built on the Yellow River, including Longyangxia Reservoir, Liujiaxia Reservoir and Xiaolangdi Reservoir. These reservoirs impound the runoff from upstream and retain the sediment, which changes the runoff and sediment conditions in the downstream reach. As a consequence, annual runoff and the frequency and peak of flooding have all decreased. As a result, the flow dynamics and their action on the river channel are also reduced, which changes the dynamic state of the river course. The discrimination results obtained using the single parameter discrimination rule and the discrimination equation show that the degree of wandering is weakened in the reaches studied. The variations in the channel pattern indicators show that the sinuosity increases and the wandering range decreases with a reduction in the total annual volume of water. However, the degree of wandering has little relationship to the sediment concentration. In addition, river training works play an important role in controlling the river course. Due to improvements in the river training works, the river course has become more stable under the same runoff and sediment conditions. A new discrimination rule that takes into account the impacts of the river training works is proposed. The discrimination results were found to fit well with the actual river pattern, which shows that the discrimination rule is applicable to the Lower Yellow River. The results show that the runoff and sediment conditions are the most important factors in the evolution of the river course. The river training works have at the same time limited the wandering range of the mainstream and played an important role in the fluvial processes. Both factors combined lead to the stabilization of the river.     

水库修建后黄河下游的河床演变（英文）

Evolution of the river channel downstream of reservoirs is a complex process that is closely related to the operational mode of the reservoirs and the channel boundary conditions. Numerous studies have been carried out on the fluvial processes of downstream reservoirs. However, only a few of them have focused on the relationship between runoff-sediment conditions and channel pattern indicators. Also, the impacts of river training works on fluvial processes are seldom dealt with. In this paper, the evolutionary processes of three sections in the Lower Yellow River, including Tiexie-Yiluo River mouth reach, Huayuankou-Heigangkou reach and Jiahetan-Gaocun reach, were analyzed for variations in the channel boundary line and the mainstream between 1960 and 2015. Channel pattern indicators such as sinuosity, mainstream wandering range and width/depth ratio were analyzed based on field measurements obtained by the Hydrological Department of the Yellow River Conservancy Commission. The effects of river training works on the channel evolution are then described. Since 1960, numerous medium- and large-sized reservoirs have been built on the Yellow River, including Longyangxia Reservoir, Liujiaxia Reservoir and Xiaolangdi Reservoir. These reservoirs impound the runoff from upstream and retain the sediment, which changes the runoff and sediment conditions in the downstream reach. As a consequence, annual runoff and the frequency and peak of flooding have all decreased. As a result, the flow dynamics and their action on the river channel are also reduced, which changes the dynamic state of the river course. The discrimination results obtained using the single parameter discrimination rule and the discrimination equation show that the degree of wandering is weakened in the reaches studied. The variations in the channel pattern indicators show that the sinuosity increases and the wandering range decreases with a reduction in the total annual volume of water. However, the degree of wandering has little relationship to the sediment concentration. In addition, river training works play an important role in controlling the river course. Due to improvements in the river training works, the river course has become more stable under the same runoff and sediment conditions. A new discrimination rule that takes into account the impacts of the river training works is proposed. The discrimination results were found to fit well with the actual river pattern, which shows that the discrimination rule is applicable to the Lower Yellow River. The results show that the runoff and sediment conditions are the most important factors in the evolution of the river course. The river training works have at the same time limited the wandering range of the mainstream and played an important role in the fluvial processes. Both factors combined lead to the stabilization of the river.     

无定河流域的人工沉积汇及其 对泥沙输移比的影响

依据1956~1996年的资料,计算出了无定河流域历年的人工沉积汇、侵蚀量、泥沙输移比,进行了时间序列分析,并运用回归分析方法,建立了统计关系,揭示了无定河流域人工沉积汇对泥沙输移比的影响。研究表明,无定河流域侵蚀量和产沙量有明显的减小趋势;人工沉积汇先是增大,达到峰值后再减小;泥沙输移比先减小而后增大。这说明,无定河泥沙输移比的时间变化趋势,主要受人工沉积汇的控制。建立的多元回归方程表明,坝地面积增大对流域泥沙输移比减小的贡献最大;地表径流系数减小对流域泥沙输移比减小的贡献居第二位;在3个降水因子中,最大30日降水的贡献最大,汛期降水次之,最大1日降水再次之。在坡面措施和沟道措施中,沟道措施对流域泥沙输移比减小的影响要大于坡面措施。     

Modelling the impact of land-use change and farm dam construction on hillslope sediment delivery to rivers at the regional scale

Landscapes in southeastern Australia have changed dramatically since the spread of European colonisation in the 19th century. Due to widespread forest clearance for cultivation and grazing, erosion and sediment yields have increased by a factor of more than 150. In the 20th century, erosion and sediment yield were reduced again due to an increasing vegetative cover. Furthermore, during the last decades, thousands of small farm dams were constructed to provide drinking water for cattle. These dams trap a lot of sediment, thereby further reducing sediment delivery from hillslopes to river channels. Changes in sediment delivery since European colonisation are documented in sediment archives. Within this study, these changing rates in hillslope erosion and sediment delivery were modelled using a spatially distributed erosion and sediment delivery model (WATEM/SEDEM) that was calibrated for Australian ecosystems using sediment yield data derived from sedimentation rates in 26 small farm dams. The model was applied to the Murrumbidgee river basin (30,000 km²) under different land-use scenarios. First, the erosion and sediment yield under pre-European land-use was modelled. Secondly, recent land-use patterns were used in the model. Finally, recent land-use including the impact of farm dams and large reservoirs was simulated. The results show that the WATEM/SEDEM model is capable of predicting the intensity of the geomorphic response to changes in land-use through time. Changes in hillslope erosion and hillslope sediment delivery rates are not equal, illustrating the non-linear response of the catchment. Current hillslope sediment supply to the river channel network is predicted to be 370% higher compared to the pre-European settlement period, yet farm dams have reduced this back to 2.5 times the pre-19th century values. The role of larger reservoirs is even more important as they have reduced the current sediment supply downstream to their pre-European values, thus completely masking the increased hillslope erosion rates from land-use change. However, the model does so far not include valley widening and sediment storage in river systems. Therefore, modelled rates of sediment delivery are lower than observed values.     

澜沧江-湄公河重金属污染评价及大坝影响(英文)

The resource development and changes of hydrological regime,sediment and water quality in the Mekong River basin have attracted great attentions.This research aimed to enhance the study on transboundary pollution of heavy metals in this international river.In this study,eight sampling sites were selected to collect the bed sand samples along the mainstream of the Mekong River.In addition,the contents of 5 heavy metal elements and their spatial variability along the mainstream of the river were analyzed.The geoaccumulation index(I geo) and potential ecological risk analysis were employed to assess heavy metal pollution status in the mainstream of the Mekong River.The results show that the average content of the heavy metal elements Zn is 91.43 mg/kg,Pb is 41.85 mg/kg,and As is 21.84 mg/kg in the bed sands of the Upper Mekong River,which are higher than those(Zn 68.17 mg/kg,Pb 28.22 mg/kg,As 14.97 mg/kg) in the Lower Mekong.The average content of Cr in the Lower Mekong is 418.86 mg/kg,higher than that in the Upper Mekong(42.19 mg/kg).Luang Prabang has a very high Cr concentration with 762.93 mg/kg and Pakse with 422.90 mg/kg.The concentration of Cu in all of the 8 sampling sites is similar,except for in Jiajiu with 11.70 mg/kg and Jiebei with 7.00 mg/kg.The results of the geoaccumulation index reveal that contaminations caused by Zn and Pb while Pb and As are more than those by Zn in Upper Mekong.Cr is the primary pollutant in the Lower Mekong,especially at Luang Prabang and Pakse.Slight pollution with As also occurs in Pakse.The potential ecological risk index indicates that the potential ecological risk of heavy metals in the mainstream of the Mekong River is low.We argue that the pollution of water quality and contamination of heavy metals in bed sediment caused by mining of mineral resources or geochemical background values in the Mekong is not transmitted from the Upper to the Lower Mekong because of the reservoir sedimentation and dilution along the river.     

Seasonal variations of sediment discharge from the Yangtze River before and after impoundment of the Three Gorges Dam

Over the past decades, > 50,000 dams and reforestation on the Yangtze River (Changjiang) have had little impact on water discharge but have drastically altered annual and particularly seasonal sediment discharge. Before impoundment of the Three Gorges Dam (TGD) in June 2003, annual sediment discharge had decreased by 60%, and the hysteresis of seasonal rating curves in the upper reaches at Yichang station had shifted from clockwise to counterclockwise. In addition, the river channel in middle-lower reaches had changed from depositional to erosional in 2002.During the four years (2003–2006) after TGD impoundment, ~ 60% of sediment entering the Three Gorges Reservoir was trapped, primarily during the high-discharge months (June–September). Although periodic sediment deposition continues downstream of the TGD, during most months substantial erosion has occurred, supplying ~ 70 million tons per year (Mt/y) of channel-derived sediment to the lower reaches of the river. If sand extraction (~ 40 Mt/y) is taken into consideration, the river channel loses a total of 110 Mt/y. During the extreme drought year 2006, sediment discharge in the upper reaches drastically decreased to 9 Mt (only 2% of its 1950–1960s level) because of decreased water discharge and TGD trapping. In addition, Dongting Lake in the middle reaches, for the first time, changed from trapping net sediment from the mainstem to supplying 14 Mt net sediment to the mainstem. Severe channel erosion and drastic sediment decline have put considerable pressure on the Yangtze coastal areas and East China Sea.     

黄河近年径流泥沙剧减的多因素贡献率分析（英文）

The Yellow River basin is well known for its high sediment yield. However, this sediment yield has clearly decreased since the 1980 s, especially after the year 2000. The annual average sediment yield was 1.2 billion tons before 2000, but has significantly decreased to 0.3 billion tons over the last 10 years. Changes in discharge and sediment yield for the Yellow River have attracted the attention of both the Central Government and local communities. This study aimed to identify the individual contributions of changes in precipitation and human activities(e.g. water conservancy projects, terracing, silt dams, socio-economic and needs, and soil and water conservation measures) to the decrease in discharge and sediment yield of the Yellow River. The study used both improved the hydrological method and the soil and water conservation method. The study focused on discharge analysis for the upper reaches and the investigation of sediments for the middle reaches of the river. The results showed that discharge and sediment yield have both presented significant decreasing trends over the past 50 years. Precipitation showed an insignificant decreasing trend over the same period. The annual average discharge decreased by 5.68 billion m3 above Lanzhou reach of the Yellow River from 2000 to 2012; human activities(e.g. socio-economic water use) contributed 43.4% of the total reduction, whereas natural factors(e.g. evaporation from lakes, wetlands and reservoirs) accounted for 56.6%. The decrease in annual discharge and sediment yield of the section between Hekouzhen station and Tongguan station were 12.4 billion m3 and 1.24 billion tons, respectively. Human activities contributed 76.5% and 72.2% of the total reduction in discharge and sediment yield, respectively, and were therefore the dominant factors in the changes in discharge and sediment yield of the Yellow River.     

Fallout radionuclide tracers identify a switch in sediment sources and transport-limited sediment yield following wildfire in a eucalypt forest

Fire can alter sediment sources and transport rates in river basins, changing landforms and aquatic habitats and degrading downstream water quality. Variability in the response between environments, between fires, and with time since fire makes predicting the catchment-scale effect of individual fires difficult. This study applies the fallout radionuclides ¹³⁷Cs and ²¹⁰Pb_xs to trace the sources and transport of fine sediment through a river network following a wildfire of moderate to extreme severity in the 629-km² eucalypt-forested Nattai River water-supply catchment near Sydney, Australia. The tracer analysis showed that post-fire erosion caused a switch in fine (< 10 µm) sediment sources from 80% subsoil derived from gully and river bank erosion to 86% topsoil derived from hillslope surface erosion. The fine sediment phosphorus content increased 4–10 fold over pre-fire levels. Annual post-fire sediment yields estimated from suspended solids rating curves were 109–250 times higher than they would have been without fire. A large additional amount of sediment remained stored within the river network for at least four years, particularly in lower-gradient reaches. Analysis of a sediment core showed that surface erosion following a previous fire had supplied at least 29% of total catchment sediment yield over the past 36 years. It is concluded that wildfire can alter catchment sediment budgets in two ways. Firstly, a spatially-diffuse pulse of elevated erosion is associated with moderate or intense rainfall events in post-fire years. Secondly, pulses of elevated catchment sediment yield are driven by the timing and river sediment transport capacity of runoff events. Severe post-fire erosion and high interannual hydrologic variability can result in large sediment stores persisting within the river network for many years. Fallout radionuclide tracers are shown to be useful in quantifying fine sediment sources and transport dynamics following wildfire, and the contribution of wildfire to catchment sediment yield.     

水电开发对河流水沙变化的综合影响评价新方法(英文)

The environmental impact assessment (EIA) of cascade dams building in international rivers has been widely discussed in China and ASEAN countries since the 1990s. In Southwest China, all the great mountainous rivers have been the major state base for large-scale hydropower development. Among these rivers, the environmental change and response of the watercourse under the cascade dams building in the upper Mekong (called Lancang River in China) has been the focus in recent 20 years. In this paper, the Lancang River, which has over 25 years of large-scale hydropower development, was chosen as a case study for establishing the affected evaluation indicators system and its regression model of runoff and sediment, determining the indicators weight by the hierarchy analysis method and factor analysis method, and setting up the quantitative evaluation models of indicators affected level based on the "marginal efficiency" principle. Using these methods and model established, the influence degree of runoff and sediment in the Lancang River from 1986 to 2007 were assessed. The major results are: (1) the impact of sediment transport change by the cascade development is much higher than that of the runoff change; (2) the years’ number with different impact levels respectively are 72.7% as the "smallest" level, 18.2% as "smaller", and 9.1% as "general"; (3) the change process of runoff and sediment shows a "U-shaped" pattern, which indicates the balance of sediment change because of the interaction of sediment reduction by Manwan reservoir storage and the increase by the Dachaoshan dam construction.     

Analysis of the contribution of multiple factors to the recent decrease in discharge and sediment yield in the Yellow River Basin,China

The Yellow River basin is well known for its high sediment yield. However, this sediment yield has clearly decreased since the 1980s, especially after the year 2000. The annual average sediment yield was 1.2 billion tons before 2000, but has significantly decreased to 0.3 billion tons over the last 10 years. Changes in discharge and sediment yield for the Yellow River have attracted the attention of both the Central Government and local communities. This study aimed to identify the individual contributions of changes in precipitation and human activities (e.g. water conservancy projects, terracing, silt dams, socio-economic and needs, and soil and water conservation measures) to the decrease in discharge and sediment yield of the Yellow River. The study used both improved the hydrological method and the soil and water conservation method. The study focused on discharge analysis for the upper reaches and the investigation of sediments for the middle reaches of the river. The results showed that discharge and sediment yield have both presented significant decreasing trends over the past 50 years. Precipitation showed an insignificant decreasing trend over the same period. The annual average discharge decreased by 5.68 billion m³ above Lanzhou reach of the Yellow River from 2000 to 2012; human activities (e.g. socio-economic water use) contributed 43.4% of the total reduction, whereas natural factors (e.g. evaporation from lakes, wetlands and reservoirs) accounted for 56.6%. The decrease in annual discharge and sediment yield of the section between Hekouzhen station and Tongguan station were 12.4 billion m³ and 1.24 billion tons, respectively. Human activities contributed 76.5% and 72.2% of the total reduction in discharge and sediment yield, respectively, and were therefore the dominant factors in the changes in discharge and sediment yield of the Yellow River.     

人类活动对黄河中游高含沙水流的影响

以黄河中游干流和渭河、无定河的资料研究了人类活动对黄土高原河流高含沙水流的发生频率的影响。人类破坏森林植被，大量拦截黄河上游清水来源区的清水基流，使得高含沙水流发生频率增大，大规模水土保持措施的实施则使高含沙水流发生频率迅速减小。近50年来黄河干流和一些支流的高含沙水流随时间的变化可以用一个三阶段模式来概括，即20世纪50-60年代，由于人类破坏植被，使高含水流频率增大；20世纪60年代末至80年代中期，大规模水土保持措施的实施使高含沙水流发生的频率减小；20世纪80年代末期以来，人类大量拦截利用清水资源，使高含沙水流的发生频率又复增大。     

台湾基隆河流域水质与环境遥感制图及分析

本文利用TM 影像和SPOT影象, 在地图资料、统计资料以及实测资料的基础上,进行了基隆河流域环境遥感制图, 并根据遥感影象灰度值与水体反射率和水中悬浮固体含量之间的相关关系,运用SPOT影象和实测数据将基隆河悬浮固体含量分为4 级。     

汉水水系水环境中稀土元素的分布特征

系统探讨了汉水水系水相（原水、滤水、悬浮物）、沉积物相中8个稀土元素的含量水平、丰度模式、悬浮物含量对水中元素含量的影响及沉积物粒度对元素的富集与分散作用等，结果表明：Eu、Lu主要以溶解态存在于水相中，而Sm主要存在于悬浮物中；汉水水中稀土元素的含量基本在世界淡水的范围内；湖库悬浮物中稀土元素含量均低于江河悬浮物，悬浮物和细粒沉积物中稀土元素含量相近，序列也基本一致；粒度对汉水沉积物中稀土元素含量的影响不明显；地表径流对水中悬浮物含量和悬浮物中稀土元素含量均有一定影响，稀土元素在汉水悬浮物、沉积物中均有一定程度的富集现象；汉水各相中均以轻稀土为主，重稀土含量较少。     

长江口水域悬沙浓度时空变化与泥沙再悬浮

根据近年来长江河口及其邻近水域8个测站1年的表层悬沙浓度逐日观测资料,并结合水动力状况,对悬沙浓度的时空变化进行了分析。结果发现,长江口自徐六泾以下悬沙浓度不断增高,并呈现口内夏高冬低,而口外冬高夏低,且量值为口外大于口内,杭州湾大于长江口。表明长江入海泥沙在海洋动力作用下强烈再悬浮;悬沙浓度在时间上呈现明显的大小潮周期和季节性变化。进一步分析认为,海洋动力 (风浪和潮流) 是泥沙再悬浮的主导因素,制约悬沙浓度的年内变化,其中潮流控制悬沙浓度的大小潮周期变化,风浪引起悬沙浓度的季节性变化,河流径流和海洋动力的对比制约悬沙浓度的空间分布。     

无定河流域产沙量变化的淤地坝效应分析

无定河流域1971~1989年的年均流量、悬移质含沙量及输沙率比1954~1970年的明显变小,而月均水沙过程曲线也发生了明显变化。上述水沙过程的变化受到1970年以来人类活动的强烈影响,而淤地坝建设是主因。为探讨淤地坝的减沙效应,提出淤地坝有效减沙面积这一概念,并拟合了动态变化的淤地坝有效减沙面积与年份之间的关系,发现该关系曲线与无定河流域各年代产沙量的变化情况相符。自1990年以来无定河流域淤地坝有效减沙面积呈明显递减趋势,导致了自上世纪90年代以来该流域的产沙量出现增大现象。为了抑制该流域的产沙量,势必需要加大淤地坝建设的力度。如果想使该流域的产沙量逐渐减少,则至少要使流域内年淤地坝有效减沙面积逐年增加。     

水沙条件对黄河下游河道输沙功能的影响

提出河道输沙功能指标F_s为进入某一河道的泥沙总量(干流与支流输入沙量之和)与输出这一河道的泥沙量之比。河道输沙功能与来水量和来沙量有密切关系,若来水减少,来沙增多,则河道输沙功能减弱。来沙中大于0.05 mm粗泥沙含量百分比与河道输沙功能指标成负相关。来沙系数、特别是粗泥沙的来沙系数,是决定黄河下游输沙功能的重要因子;来沙系数越大,则河道输沙功能指标越低。场次洪水的输沙功能指标随场次洪水最大含沙量的增大而降低,历年河道输沙功能指标随各年中高含沙水流频率的增高而降低。小浪底水库修建后,为我们通过调水调沙提高河道输沙功能提供可能。研究表明,场次洪水平均含沙量35 kg/m³,或场次洪水平均来沙系数为(0.015 kg·s)/m⁶,是在调水调沙中实现河道输沙功能优化的最优含沙量和最优来沙系数,平滩流量则是实现河道输沙功能最大化的最优流量级。     

黄河入海泥沙悬移输送机制的控制试验(英文)

Five diagnostic experiments with a 3D baroclinic hydrodynamic and sediment transport model ECOMSED in couple with the third generation wave model SWAN and the Grant-Madsen bottom boundary layer model driven by the monthly sediment load of the Yellow 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. Both transport and spatio-temporal distribution of suspended sediment concentration in the Bohai Sea were numerially simulated. 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, and only very small of them are transported faraway. On the basis of wind forcing, sediments from the Yellow River are mainly transported north-northwestward, and others which are first delivered to the Laizhou Bay are continuously moved northward. An obvious 3D structure characteristic of sediment transport is produced in the wind-driven and tide-induced residual circulation condition. Transport patterns at all layers are generally consistent with circulation structure, but there is apparent deviation between the depth-averaged sediment flux and the circulation structure. The phase of temporal variation of sediment concentration is consistent with that of the bottom shear stress, both of which are proved to have a ten-day cycle in wave and current condition.     

Diagnostic experiments for transport mechanisms of suspended sediment discharged from the Yellow River in the Bohai Sea

Five diagnostic experiments with a 3D baroclinic hydrodynamic and sediment transport model ECOMSED in couple with the third generation wave model SWAN and the Grant–Madsen bottom boundary layer model driven by the monthly sediment load of the Yellow 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. Both transport and spatio-temporal distribution of suspended sediment concentration in the Bohai Sea were numerially simulated. 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, and only very small of them are transported faraway. On the basis of wind forcing, sediments from the Yellow River are mainly transported north-northwestward, and others which are first delivered to the Laizhou Bay are continuously moved northward. An obvious 3D structure characteristic of sediment transport is produced in the wind-driven and tide-induced residual circulation condition. Transport patterns at all layers are generally consistent with circulation structure, but there is apparent deviation between the depth-averaged sediment flux and the circulation structure. The phase of temporal variation of sediment concentration is consistent with that of the bottom shear stress, both of which are proved to have a ten-day cycle in wave and current condition.