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Numerical Study on Seasonal Transportation of the Suspended Sediments in the Modern Yellow River Mouth Effected by the Artificial Water and Sediment Regulation 被引量:3
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作者 WANG Nan QIAO Lulu +5 位作者 LI Guangxue ZHONG Yi SONG Dehai DING Dong GAO Fei JI Fengying 《Journal of Ocean University of China》 SCIE CAS CSCD 2019年第1期20-30,共11页
Since 2002, an artificial water and sediment regulation(AWSR) has been carried out, which largely reduced water and sediment discharged from the Yellow River into the Bohai Sea. Although the sediment transport in the ... Since 2002, an artificial water and sediment regulation(AWSR) has been carried out, which largely reduced water and sediment discharged from the Yellow River into the Bohai Sea. Although the sediment transport in the Yellow River Mouth(YRM) has been observed and modeled intensively since AWSR, but preferentially for the non-storm conditions. In this study, a three-dimensional current-wave-sediment coupled model, DHI-MIKE numerical model, was used to examine the seasonal suspended-sediment transport in the YRM after the AWSR. Results show that the seasonal distribution of suspended-sediments in the YRM is dominated by wind and wave rather than river input. The major transport pathway of suspended-sediments is from the western Laizhou Bay to the Bohai Strait during the winter monsoon, especially in storm events. In addition, about 66% of the river sediments deposit within 30 km of the YRM, which is smaller than previous estimations. It suggests that the YRM has been eroded in recent decades. 展开更多
关键词 yellow river mouth artificial water and SEDIMENT regulation MIKE suspended-sediment transport SEASONAL variation
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The Marine Dynamics and Changing Trend off the Modern Yellow River Mouth 被引量:5
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作者 WANG Nan LI Guangxue +3 位作者 XU Jishang QIAO Lulu DADA Olusegun A. ZHOU Chunyan 《Journal of Ocean University of China》 SCIE CAS 2015年第3期433-445,共13页
Topography around the Yellow River mouth has changed greatly in recent years, but studies on the current state of ma- rine dynamics off the Yellow River mouth are relatively scarce. This paper uses a two-dimension num... Topography around the Yellow River mouth has changed greatly in recent years, but studies on the current state of ma- rine dynamics off the Yellow River mouth are relatively scarce. This paper uses a two-dimension numerical model (MIKE 21) to reveal the tidal and wave dynamics in 2012, and conducts comparative analysis of the changes from 1996 to 2012. The results show that M2 amphidromic point moved southeastward by 11 kin. It further reveals that the tides around the Yellow River mouth are relatively stable due to the small variations in the tidal constituents. Over the study period, there is no noticeable change in the distribution of tidal types and tidal range, and the mean tidal range off the river mouth during the period studied is 0.5-1.1 m. However, the tidal currents changed greatly due to large change in topography. It is observed that the area with strong tidal currents shifted from the old river mouth (1976-1996) to the modem river mouth (1996-present). While the tidal current speeds decreased continually off the old river mouth, they increased off the modem river mouth. The Maximum Tidal Current Speed (MTCS) reached 1.4 m s-1, and the maximum current speed of 50-year return period reached 2.8 m s-1. Waves also changed greatly due to change in topography. The significant wave height (H1/3) of 50-year return period changed proportionately with the water depth, and the ratio of Hi/3 to depth being 0.4-0.6. H1/3 of the 50-year return period in erosion zone increased continually with increasing water depth, and the rate of change varied between 0.06 and 0.07myr-1. Based on the results of this study, we infer that in the future, the modem river mouth will protrude gradually northward, while the erosion zone, comprising the old river mouth and area between the modern river mouth and the old river mouth (Intermediate region) will continue to erode. As the modem river mouth protrudes towards the sea, there will be a gradual increase in the current speed and decrease in wave height. Conversely, the old river mouth will retreat, with gradual decrease in current speed and increase in wave height. As more coastal constructions spring up around the Yellow River mouth in the future, we recommend that variation in hydrodynamics over time should be taken into consideration when designing such coastal constructions. 展开更多
关键词 yellow river mouth tidal dynamics WAVE numerical simulation change trend 50-year return period
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Spatial Variation and Risk Assessment of Arsenic and Heavy Metals in Surface Water and Suspended Particulate Matter in Tail Reaches of the Yellow River, China 被引量:1
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作者 SUN Zhigao LI Jing +2 位作者 TIAN Liping CEHN Bingbing HU Xingyun 《Chinese Geographical Science》 SCIE CSCD 2021年第1期181-196,共16页
To determine the pollution levels and potential toxic risks of arsenic(As) and heavy metals(Cr, Ni, Cu, Zn, Pb and Cd) in water and suspended particulate matter(SPM) in tail reaches(including freshwater reach and low-... To determine the pollution levels and potential toxic risks of arsenic(As) and heavy metals(Cr, Ni, Cu, Zn, Pb and Cd) in water and suspended particulate matter(SPM) in tail reaches(including freshwater reach and low-salinity reach) of the Yellow River as the Flow-Sediment Regulation Project(FSRP) has been carried out for approximately 15 yr, the surface water and SPM were sampled at pre-flood(April) and post-flood seasons(October). Results showed that similar changes of As and metal levels in water and SPM were observed along the tail reaches at pre-flood or post-flood season. Compared to pre-flood season, the levels of As, Cu, Cr and Ni in freshwater reach and the concentrations of Cr and Ni in low-salinity reach rose greatly at post-flood season. The levels of As and metals in SPM of freshwater reach or low-salinity reach at pre-flood season were significantly higher than those at post-flood season(P < 0.01).The pollutions of As and metals in surface water of tail reaches at pre-flood or post-flood season were not serious. The SPM in freshwater reach at pre-flood season were polluted by Cd, As, Cr, Cu and Ni while those in low-salinity reach were polluted by Cd and Cr. The SPM in freshwater reach at post-flood season were polluted by Cd and Pb while those in low-salinity reach were polluted by Cd and Cr.Cd was identified as heavy metal of primary concern at both pre-flood and post-flood seasons. Combined with the existed data reported in present research, this study found that the toxic risk of As and metals in SPM of tail reaches at pre-flood season was higher than that at post-flood season, implying that the implementation of FSRP during flooding season, to a great extent, reduced the toxic risk of these elements. With the long-term implementation of FSRP, the pollution levels of As and metals(particularly for Cd) in SPM of tail reaches might be elevated and the potential toxic risk primarily produced by Cr, Ni and As might be increased if effective measures were not taken in future. 展开更多
关键词 arsenic and heavy metals surface water suspended particulate matter tail reaches yellow river
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An Information Entropy-Based Methodology to Construct the Avulsion Threshold in the Tail Reach of the Estuarine Alluvial Plain
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作者 YANG Zhuo-yuan XIA Jun-qiang +3 位作者 DENG Shan-shan ZHOU Mei-rong JI Zu-wen YU Xin 《China Ocean Engineering》 SCIE EI CSCD 2023年第5期794-806,共13页
Channel avulsion is a natural phenomenon that occurs abruptly on alluvial river deltas,which can affect the channel stability.The causes for avulsion could be generally categorized as topography-and flood-driven facto... Channel avulsion is a natural phenomenon that occurs abruptly on alluvial river deltas,which can affect the channel stability.The causes for avulsion could be generally categorized as topography-and flood-driven factors.However,previous studies on avulsion thresholds usually focused on topography-driven factors due to the centurial or millennial avulsion timescales of the world’s most deltas,but neglected the impacts of flood-driven factors.In the current study,a novel demarcation equation including the two driven factors was proposed,with the decadal timescale of avulsion being considered in the Yellow River Estuary(YRE).In order to quantify the contributions of different factors in each category,an entropy-based methodology was used to calculate the contributing weights of these factors.The factor with the highest weight in each category was then used to construct the demarcation equation,based on avulsion datasets associated with the YRE.An avulsion threshold was deduced according to the demarcation equation.This avulsion threshold was then applied to conduct the risk assessment of avulsion in the YRE.The results show that:two dominant factors cover respectively geomorphic coefficient representing the topography-driven factor and fluvial erosion intensity representing the flood-driven factor,which were thus employed to define a two dimensional mathematical space in which the demarcation equation can be obtained;the avulsion threshold derived from the equation was also applied in the risk assessment of avulsion;and the avulsion threshold proposed in this study is more accurate,as compared with the existing thresholds. 展开更多
关键词 avulsion threshold threshold conditions entropy weight method tail reach yellow river Estuary
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Numerical simulation of tides, tidal currents and residual currents in the Yellow River estuary 被引量:4
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作者 GAO Jia CHEN Xue-en +1 位作者 YU Hua-ming Ming LI 《Marine Science Bulletin》 CAS 2016年第1期1-8,共8页
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
关键词 Huanghe (yellow river) mouth numerical simulation TIDES tidal currents shear fronts residual currents
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现行黄河口分汊河道的分流特征及其影响机制 被引量:1
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作者 葛春海 范勇勇 +5 位作者 巴旗 孙超 吴振 吴晓 王厚杰 毕乃双 《海洋地质与第四纪地质》 CAS CSCD 北大核心 2024年第2期131-145,共15页
自2013年黄河尾闾河道出汊形成双槽入海的河口汊道,控制了河口流量的分配,但其分流特征及其影响机制尚不清楚。本文基于Delft3D构建了黄河口汊道的水动力三维数值模型,模拟了不同工况下河口汊道的分流特征,揭示了其影响机制。结果表明:... 自2013年黄河尾闾河道出汊形成双槽入海的河口汊道,控制了河口流量的分配,但其分流特征及其影响机制尚不清楚。本文基于Delft3D构建了黄河口汊道的水动力三维数值模型,模拟了不同工况下河口汊道的分流特征,揭示了其影响机制。结果表明:河口汊道的分流不对称性随流量的增加而减小,流量增加加大了东汊与北汊河道的水位梯度差,使得从东汊河道的流量增量较北汊河道大,河流流量的分配更加均匀。潮汐作用增强了河口汊道的流量不对称性,而随着径流量的增加,潮汐的增强作用逐渐减弱。这主要由于在半日潮的作用下,东汊和北汊河道水位梯度的差异,形成河口潮汐的“东阻北促”效应,增强了河口汊道的分流不对称性。 展开更多
关键词 分汊河道 分流不对称性 潮汐 径流量 黄河口
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Quantitative relationship of the sedimentation in the lower Yellow River with its mouth channel extension
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作者 Shi, CX Ye, QC 《Chinese Science Bulletin》 SCIE EI CAS 1997年第8期681-684,共4页
THE effect of extension of the mouth channel on the sedimentation in the lower Yellow
关键词 the lower yellow river mouth CHANNEL EXTENSION longitudinal profile in equilibrium DOWNWARD ACCUMULATION headward accumulation.
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大型水库运用对河口尾闾河道出汊的影响研究
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作者 杨卓媛 夏军强 +1 位作者 宋红波 刘国强 《人民黄河》 CAS 北大核心 2024年第4期37-42,共6页
为定量研究大型水库运用对河口尾闾河道出汊的影响,以黄河口尾闾段为研究对象提出了一种基于改进熵权法的河道出汊阈值确定方法,根据实测水沙资料确定了尾闾河道出汊指标计算公式及相应的河道出汊阈值,在还原无小浪底工程时尾闾段水沙... 为定量研究大型水库运用对河口尾闾河道出汊的影响,以黄河口尾闾段为研究对象提出了一种基于改进熵权法的河道出汊阈值确定方法,根据实测水沙资料确定了尾闾河道出汊指标计算公式及相应的河道出汊阈值,在还原无小浪底工程时尾闾段水沙及河槽形态调整过程的基础上,结合出汊阈值对比分析了有、无小浪底工程时尾闾段发生河道出汊概率的差异。结果表明:河段河相系数和汛期平均水流冲刷强度分别为边界和水沙条件中对河道出汊贡献最大的两个指标;黄河口尾闾段河道出汊阈值为38.16,当出汊指标大于38.16时尾闾段发生河道出汊;小浪底工程运用约束了进入尾闾段的沙量,河道出汊概率明显减小。 展开更多
关键词 河道出汊阈值 水沙条件 河床调整 黄河口尾闾段 小浪底水库
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Temporal and spatial evolution of coastline and subaqueous geomorphology in muddy coast of the Yellow River Delta 被引量:6
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作者 PENG Jun MA Suisui +1 位作者 CHEN Hongquan LI Zhiwen 《Journal of Geographical Sciences》 SCIE CSCD 2013年第3期490-502,共13页
Based on measured data of coastline and bathometry, processed by softwares of Surfer and Mapinfo, and combined with sediment loads in different phases at Lijin gauging station, temporal and spatial evolution of coastl... Based on measured data of coastline and bathometry, processed by softwares of Surfer and Mapinfo, and combined with sediment loads in different phases at Lijin gauging station, temporal and spatial evolution of coastline and subaqueous geomorphology in muddy coast of the Yellow River Delta is analyzed. The results show that ~68% of sediments were delivered by the Yellow River deposited around the river mouth and in the littoral area from 1953 to 2000. Coastline in different coasts had distinctive changes in response to shifts of river course. Coastline was stable in the west of the Diaokou river mouth. Coastline from the east of the Diaokou river mouth to the north of the Gudong oilfield had experienced siltation, then serious erosion, and finally kept stable with sea walls conservation. Generally, coastline of the survived river mouth of the Qingshuigou river course stretched seaward, whereas the south side of sand spit at the Qingshuigou old river mouth was eroded after the Yellow River inpouring near the position at the Qing 8. The subaqueous geomorphology off the survived river mouth exhibited siltation from 1976 to 1996, with flat topset beds and steeper foreset beds. From 1996 to 2005, the subaqueous geomorphology off the Qingshuigou old river mouth was eroded in the topset and foreset beds, but silted in the bottomset beds. The subaqueous geomorphology off the new river mouth sequentially performed siltation with small degree compared to that of 1976-1996. 展开更多
关键词 yellow river Delta COASTLINE river mouth subaqueous geomorphology EVOLUTION
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苏北废黄河口滨海港建设对近海水沙和床面冲淤的影响
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作者 黄哲 刘强 +2 位作者 倪万洲 徐海珏 白玉川 《海洋地质前沿》 CSCD 北大核心 2023年第12期43-55,共13页
以废黄河三角洲海岸盐城市滨海港的建设为背景,通过建立二维潮流泥沙数学模型,模拟建港前后水动力场环境与泥沙运移变化,分析滨海港建设对近海水沙的影响。南北堤建成后,流速变化主要集中在防波堤建设区域15 m等深线以内海域,变化量为−0... 以废黄河三角洲海岸盐城市滨海港的建设为背景,通过建立二维潮流泥沙数学模型,模拟建港前后水动力场环境与泥沙运移变化,分析滨海港建设对近海水沙的影响。南北堤建成后,流速变化主要集中在防波堤建设区域15 m等深线以内海域,变化量为−0.8~0.5 m/s。北堤堤头流速增幅明显,除大潮落急外港区均处在流速减小区,流速衰减幅度最高可达0.6 m/s。建港工程造成海域内潮汐不规则性减弱,主要分潮的平均振幅比降低约10%。建港工程对近海地貌格局的影响集中在港区周围8 km范围,且基本在16 m等深线以内海域,淤积区域分布在港区口门周围,冲刷区域分布在北堤堤头,床面变化随着时间推移加剧。 展开更多
关键词 滨海港 废黄河口 水动力环境 泥沙运动
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尾矿最大、最小孔隙比分布模型及验证
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作者 李识博 李浩 +2 位作者 吴江伟 谢桐 权烨孜 《金属矿山》 CAS 北大核心 2023年第4期213-221,共9页
黄河重点生态区的矿山开采中,尾矿库坝的安全与稳定将影响矿区与黄河流域的高质量发展。以影响尾矿密实程度、孔隙特征及结构变形与稳定的物理指标最大、最小孔隙比为研究对象,对比25种不同粒径,7~9种不同细粒含量尾矿最大、最小孔隙比... 黄河重点生态区的矿山开采中,尾矿库坝的安全与稳定将影响矿区与黄河流域的高质量发展。以影响尾矿密实程度、孔隙特征及结构变形与稳定的物理指标最大、最小孔隙比为研究对象,对比25种不同粒径,7~9种不同细粒含量尾矿最大、最小孔隙比结果,得到了由参数ε和ω确定最大或最小孔隙比随细粒分布函数;且发现参数εmax(ωmax)与εmin(ωmin)成线性相关。由此,建立粗细二元混合尾矿最大、最小孔隙比线性关系模型,推导确定线性关系的斜率α和截距β值;根据α和β值,反算189组尾矿的最小孔隙比,反算结果与实测结果的误差不超过6%。以上模型的建立可有效预测二元结构混合尾矿的孔隙比范围,为库内尾矿的堆积与稳定预测提供可靠的指标范围,进而为黄河流域矿区生态环境保护与灾害防控提供相关参数。 展开更多
关键词 黄河流域 尾矿 最大最小孔隙比 细粒含量 粒径
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黄河三角洲刁口叶瓣堆积过程
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作者 邢吕阳 李广雪 +2 位作者 刘思雨 李浩楠 潘煜峰 《海洋地质与第四纪地质》 CAS CSCD 北大核心 2023年第4期97-104,共8页
黄河三角洲刁口叶瓣于1964—1976年间堆积而成,中国大型滩浅海油田—埕岛油田在这个叶瓣上建设开发,该叶瓣的形成过程与地层结构对海洋工程建设影响较大。根据多年历史测深资料,研究了刁口叶瓣形成期间河口摆动与堆积体演变过程,依据堆... 黄河三角洲刁口叶瓣于1964—1976年间堆积而成,中国大型滩浅海油田—埕岛油田在这个叶瓣上建设开发,该叶瓣的形成过程与地层结构对海洋工程建设影响较大。根据多年历史测深资料,研究了刁口叶瓣形成期间河口摆动与堆积体演变过程,依据堆积中心的位置变化明确了古河口摆动规律。1964—1966年河口及堆积体在叶瓣西侧发育,在柯氏力作用下,河口逐渐NNE向摆动,堆积中心移动到叶瓣东侧;1975—1976年,由于河道摆动曲率过大引发失稳,河道取直后堆积中心又回到叶瓣西侧。根据堆积速率和河口位置将形成期分为3个阶段:近岸堆积阶段(1964—1966年)、整体堆积阶段(1966—1975年)和调整堆积阶段(1975—1976年)。受黄河海港附近M2无潮点影响下的强潮流场控制,刁口叶瓣东侧在形成早期和末期存在局部冲刷作用,而叶瓣西侧是三角洲形成期堆积最活跃的区域。 展开更多
关键词 堆积中心 河口摆动 刁口叶瓣 黄河三角洲
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黄河口尾闾段河道出汊机理中的河床边界条件 被引量:1
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作者 杨卓媛 张浮平 徐驰 《中国农村水利水电》 北大核心 2023年第6期133-137,共5页
黄河口尾闾段河道出汊机理研究涉及出汊类型、出汊特征、水沙与河床边界条件等问题,河床边界条件是河道出汊的关键影响因素之一。研究在探明近期黄河口尾闾段河道出汊摆动特点的基础上,揭示了黄河口尾闾段河道出汊机理,并基于黄河口尾... 黄河口尾闾段河道出汊机理研究涉及出汊类型、出汊特征、水沙与河床边界条件等问题,河床边界条件是河道出汊的关键影响因素之一。研究在探明近期黄河口尾闾段河道出汊摆动特点的基础上,揭示了黄河口尾闾段河道出汊机理,并基于黄河口尾闾段实测地形资料,探析了河床边界条件的时空变化特征及其对河道出汊的影响。结果表明:河相系数是决定黄河口尾闾段河道出汊位置的主要影响因素,滩地横比降变化特征和深泓线位置变化决定河道出汊的摆动方向。 展开更多
关键词 河道出汊 机理 河床边界条件 黄河口 尾闾段
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黄河清水沟流路河口尾闾段河床形态萎缩特征 被引量:16
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作者 王开荣 黄海军 张永平 《海洋地质与第四纪地质》 CAS CSCD 北大核心 2008年第2期15-22,共8页
在简述黄河河口尾闾河段相关特征的基础上,从河槽横断面形态、河床纵剖面形态包括主槽河底平均高程、河床纵比降、平滩流量变化等方面分析了黄河河口尾闾河段河床形态萎缩特征。清水沟流路在1976—2000年期间,黄河口尾闾河段的发育大致... 在简述黄河河口尾闾河段相关特征的基础上,从河槽横断面形态、河床纵剖面形态包括主槽河底平均高程、河床纵比降、平滩流量变化等方面分析了黄河河口尾闾河段河床形态萎缩特征。清水沟流路在1976—2000年期间,黄河口尾闾河段的发育大致可分为4个阶段,即初期发育阶段、中期成型阶段、后期萎缩阶段、末期人工干预发展阶段。相应的发育时期分别为20世纪80年代中期以后,尾闾河段主槽宽深比上升、横比降升高、河段纵比降下降、河床平均高程抬升,其相应时期内河道平滩流量相对偏低。这一现象可能与黄河来水来沙偏枯相关。河道疏浚、人工出汊、调水调沙等措施对尾闾河段河床形态的萎缩有一定的抑制作用,但其影响是暂时的,不能改变河道萎缩的总体趋势。 展开更多
关键词 河床形态 萎缩特征 尾闾河段 黄河河口
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近、现代黄河三角洲发育演变研究进展 被引量:14
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作者 时连强 李九发 +3 位作者 应铭 李为华 陈沈良 张国安 《海洋科学进展》 CAS CSCD 北大核心 2005年第1期96-104,共9页
系统综述了1980年以来国内有关近、现代黄河三角洲发育演变的研究进展。总结了三角洲变迁对黄河下游近口河段的反馈影响和三角洲发育模式等研究成果。重点评述了黄河三角洲的形成影响因素和冲淤演变过程,肯定了数值计算方法和遥感与GIS... 系统综述了1980年以来国内有关近、现代黄河三角洲发育演变的研究进展。总结了三角洲变迁对黄河下游近口河段的反馈影响和三角洲发育模式等研究成果。重点评述了黄河三角洲的形成影响因素和冲淤演变过程,肯定了数值计算方法和遥感与GIS技术已经成为定量计算与半定量分析黄河三角洲冲淤演变的重要研究手段。并指出今后研究的主要问题,包括突发性事件在潮滩冲淤变化中的作用、人类活动影响程度的定量表达、岸滩处于不冲不淤时的最佳剖面形态、现有冲淤数值模型的完善和GIS与数值模型系统的集成研究等。 展开更多
关键词 黄河三角洲 发育演变 冲淤 黄河口
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GIS支持下的黄河口近期淤、蚀动态研究 被引量:27
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作者 赵庚星 张万清 +1 位作者 李玉环 陈乐增 《地理科学》 CSCD 北大核心 1999年第5期442-445,共4页
以遥感和地理信息系统(GIS) 技术研究了黄河口1986 年5 月至1996 年10 月淤积与侵蚀面积的变化及其空间动态。结果显示:黄河口1990 年1 月以前以淤积为主,而1990 年1 月以后则以侵蚀为主,河口向渤海推进... 以遥感和地理信息系统(GIS) 技术研究了黄河口1986 年5 月至1996 年10 月淤积与侵蚀面积的变化及其空间动态。结果显示:黄河口1990 年1 月以前以淤积为主,而1990 年1 月以后则以侵蚀为主,河口向渤海推进的速率也呈明显降低的趋势。侵蚀主要发生于河口北部和西南部,淤积的主要部位是河口嘴部及其南部。 展开更多
关键词 GIS 黄河口 淤积 侵蚀
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黄河口及莱州湾表层沉积物中重矿物分布与来源 被引量:31
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作者 王昆山 石学法 +2 位作者 蔡善武 乔淑卿 姜晓黎 《海洋地质与第四纪地质》 CAS CSCD 北大核心 2010年第6期1-8,共8页
对2007年采自渤海黄河口和莱州湾内250个表层沉积物进行了重矿物研究。结果表明,黄河口和莱州湾重矿物含量很低,平均为1.51%,优势重矿物组合为云母-普通角闪石-绿帘石,其中白云母含量高于黑云母。重矿物分布和组合分区表明沉积物的物质... 对2007年采自渤海黄河口和莱州湾内250个表层沉积物进行了重矿物研究。结果表明,黄河口和莱州湾重矿物含量很低,平均为1.51%,优势重矿物组合为云母-普通角闪石-绿帘石,其中白云母含量高于黑云母。重矿物分布和组合分区表明沉积物的物质来源主要为黄河口输入物质,莱州湾西南部河流输入物质及山东半岛西部岛屿冲刷产物为次要物质来源;重矿物特别是云母类可作为沉积物输送和扩散的指标,综合其他矿物分布特征得出,黄河入海沉积物的扩散趋势在南北向以北向为主要的输送方向,黄河口物质具有向东扩散的趋势。 展开更多
关键词 沉积物 物质来源 重矿物 莱州湾 黄河口
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黄河口拦门沙对尾闾河道反馈影响的试验研究 被引量:6
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作者 曹文洪 胡春宏 +2 位作者 姜乃森 胡海华 傅玲燕 《泥沙研究》 CSCD 北大核心 2005年第1期1-6,共6页
通过模型试验,研究河口淤积延伸、不同尺寸和位置拦门沙对尾闾河道的反馈影响,并探讨河口径流与潮流交汇点(滞流点)与拦门沙的关系。研究结果表明,河口拦门沙的形成与滞流点的关系非常密切,滞流点的位置基本在拦门沙顶部变动,在径流量为... 通过模型试验,研究河口淤积延伸、不同尺寸和位置拦门沙对尾闾河道的反馈影响,并探讨河口径流与潮流交汇点(滞流点)与拦门沙的关系。研究结果表明,河口拦门沙的形成与滞流点的关系非常密切,滞流点的位置基本在拦门沙顶部变动,在径流量为500~1500m3s时,滞流点的变化范围在5km左右。河口演变对尾闾河道泄洪排沙的影响包括河口淤积延伸的影响和拦门沙的影响,河口淤积延伸的影响是主要的,拦门沙尺寸变化的影响是有限的,其影响范围一般在口门以上25km以内。 展开更多
关键词 黄河口 拦门沙 河道 反馈
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黄河河口湿地景观变化影响丹顶鹤生境的评价分析 被引量:17
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作者 黄翀 刘高焕 +1 位作者 张海龙 单凯 《地球信息科学》 CSCD 北大核心 2009年第4期491-497,共7页
上世纪90年代以来,在全球气候变化及人类活动的影响下,黄河河口湿地景观发生了显著变化,对河口湿地生态系统及生物多样性保护带来深远影响。本文以景观生态学理论为指导,利用遥感技术和GIS空间分析方法,在对河口湿地景观变化过程分析的... 上世纪90年代以来,在全球气候变化及人类活动的影响下,黄河河口湿地景观发生了显著变化,对河口湿地生态系统及生物多样性保护带来深远影响。本文以景观生态学理论为指导,利用遥感技术和GIS空间分析方法,在对河口湿地景观变化过程分析的基础上,以丹顶鹤为指示物种,重点探讨了湿地景观变化对物种生境的影响,进而为河口退化湿地生态系统恢复和重建,以及湿地生境保护提供理论依据和决策支持。本文研究表明,1992-1999年,黄河三角洲河口湿地干旱化趋势明显,芦苇沼泽和翅碱蓬滩涂萎缩严重,丹顶鹤适宜生境面积大幅度减少,近30%的栖息地生境发生退化,严重退化的生境占11%。1999-2006年,在水量调控及湿地恢复措施的影响下,芦苇沼泽、翅碱蓬滩涂,以及水面湿地面积都有显著增加,占栖息地总面积28.7%的生境,得到一定程度的改善。但受不断加剧的景观破碎化影响,生境得到较好恢复的栖息地面积只占12%。研究认为,对于退化湿地的修复,在改善湿地景观的同时,加强生境管理,减轻人为活动引起的生境破碎化影响,是一重要的措施。 展开更多
关键词 黄河口 湿地 景观 动态 生境
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黄河口及邻近渤海海域表层沉积物中CaO和蒙皂石分布及其对黄河入海物质运移的指示 被引量:7
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作者 乔淑卿 方习生 +4 位作者 石学法 王昆山 刘焱光 刘升发 朱爱美 《海洋地质与第四纪地质》 CAS CSCD 北大核心 2010年第1期17-23,共7页
利用X射线荧光和X射线衍射仪,对2007年8—9月取自现代黄河口及其邻近渤海海域的250个表层沉积物中的CaO和蒙皂石含量做了分析。结果表明,CaO和蒙皂石含量平面分布趋势相似,总体呈现由黄河口向东方向逐渐降低的趋势,依次可以划分出莱州... 利用X射线荧光和X射线衍射仪,对2007年8—9月取自现代黄河口及其邻近渤海海域的250个表层沉积物中的CaO和蒙皂石含量做了分析。结果表明,CaO和蒙皂石含量平面分布趋势相似,总体呈现由黄河口向东方向逐渐降低的趋势,依次可以划分出莱州湾西部高值区(Ⅰ区)、中间过渡区(Ⅱ区)和莱州湾东部低值区(Ⅲ区)。研究区沉积物中CaO和蒙皂石含量的这种分布特征,主要是黄河入海物质和水动力条件共同作用的结果。因此,该区域CaO和蒙皂石含量的分布不仅能反映黄河入海沉积物的运移,同时,对黄河口区的水动力条件有很好的指示意义。 展开更多
关键词 沉积物 碳酸钙 黏土矿物 莱州湾 黄河三角洲
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