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Dynamical Control of Asymmetrically Oblique Tidal Currents to the Sedimentary Characteristics and Development of Linear Sand Ridges in the Liaodong Shoal, East Bohai Sea

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Journal of Ocean University of China 2020年第1期19卷 101-112页

作者： ZHANG Lianjie ZHU Longhai wu jianzheng HU Rijun WANG Peng ZHANG Pan College of Marine Geosciences Ocean University of ChinaQingdao 266100China Key Laboratory of Submarine Geosciences and Prospecting Techniques Ministry of EducationOcean University of ChinaQingdao 266100China National Marine Environmental Monitoring Center Dalian 116000China

The Liaodong Shoal is a group of linear sand ridges located in the east Bohai Sea of *** this study,54 surface sediment samples have been collected,current measurements at 4 stations have been carried out and bathymetric data were *** current directions are rightward deflected relative to the strikes of the sand *** by the narrowing effect of the ridge,the current velocities exhibited an anti-‘C’type vertical *** velocities of the lower currents linearly correlate with the water *** near-bed current velocities over the troughs are estimated to be higher than those over the ridges,and this feature could be explained by the loss of kinetic energy together with the conversion between kinetic energy and gravitational potential *** sedimentary characteristics that are compatible with the tidal dynamics are developed across the ridges and troughs,including grain size compositions,grain size parameters,mineral compositions and Dhm *** existence of the angles between the current directions and the strikes of the sand ridges is the key factor for the growth of the sand *** asymmetric hydrodynamic features between the flood and ebb currents lead to the differences in the topographical and sedimentary characteristics on both sides of a sand *** material supply led to the degradation of the sand ridges,and the reduction of the tidal current intensity has led to the development of the subordinate sand ridges in the *** ridges are migrating.

关键词： Liaodong Shoal tidal current ridge heavy minerals sedimentary characteristic development and evolution

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Suspended Sediment Transport and Deposition in the Zhoushan Archipelago Sea Area

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Journal of Ocean University of China 2009年第4期8卷 343-351页

作者： HU Rijun wu jianzheng ZHU Longhai MA Fang College of Marine Geoscience Ocean University of China Qingdao 266100 P. R. China Key Laboratory of Submarine Geosciences and Prospecting Techniques Ministry of Education Ocean University of China Qingdao 266100 P. R. China North China Sea Branch State Oceanic Administration Qingdao 266033 P. R. China

The transport mechanism and settlement characteristics of suspended sediments are analyzed in this article on the basis of measured data. Results indicate that the concentration and flux of suspended sediments decrease sharply from Hangzhou Bay to the offshore area. Suspended sediment transport is mainly controlled by advection transport and gravitational circulation transport. The settling velocity of suspended sediments gradually decreases from Hangzhou Bay to the offshore area. The settlement of suspended sediments mainly takes place during the turning phase of the tidal currents.

关键词： Zhoushan Archipelago suspended sediments transport dynamic mechanism settlement characteristics

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Beach Morphology and Coastline Evolution in the Southern Bohai Strait

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Journal of Ocean University of China 2015年第5期14卷 803-815页

作者： ZHANG Wei wu jianzheng LI Weiran ZHU Longhai HU Rijun JIANG shenghui SUN Yonggen WANG Huijuan College of Marine Geoscience Ocean University of China Qingdao Marine Geological Engineering Investigation Institute Key Laboratory of Submarine Geosciences and Prospecting Techniques Ministry of EducationOcean University of China First Institute of Oceanography SOA Qingdao Boyan Marine Environment Science & Technology Co.Ltd.

The beach studied in this paper spans a length of 51 km and is one of several long sandy beaches in the southern Bohai Strait. Due to the obstruction of islands in the northeast and the influence of the underwater topography, the wave environment in the offshore area is complex; beach types and sediment transport characteristics vary along different coasts. The coastlines extracted from six aerial photographs in different years were compared to demonstrate the evolving features. Seven typical beach profiles were selected to study the lateral beach variation characteristics. Continuous wind and wave observation data from Beihuangcheng ocean station during 2009 were employed for the hindcast of the local wave environment using a regional spectral wave model. Then the results of the wave hindcast were incorporated into the LITDRIFT model to compute the sediment transport rates and directions along the coasts and analyze the longshore sand movement. The results show that the coastline evolution of sand beaches in the southern Bohai Strait has spatial and temporal variations and the coast can be divided into four typical regions. Region （1）, the north coast of Qimudao, is a slightly eroded and dissipative beach with a large sediment transport rate; Region （II）, the southwest coast of Gangluan Port, is a slightly deposited and dissipative beach with moderate sediment transport rate; Region （III）, in the central area, is a beach that is gradually transformed from a slightly eroded dissipative beach to a moderately or slightly strong eroded bar-trough beach from west to east with a relatively moderate sediment transport rate. Region （IV）, on the east coast, is a strongly eroded and reflective beach with a weak sediment transport rate. The wave conditions exhibit an increasing trend from west to east in the off- shore area. The distribution of the wave-induced current inside the wave breaking region and the littoral sediment transport in the nearshore region exhibit a gradua

关键词： sand beach coastline evolution profile feature wave hind-casting wave-induced current littoral sediment transport

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Sediment Transport in the Nearshore Area of Phoenix Island

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Journal of Ocean University of China 2016年第5期15卷 767-782页

作者： HU Rijun MA Fang wu jianzheng ZHANG Wei JIANG Shenghui XU Yongchen ZHU Longhai WANG Nan LIU Aijiang College of Marine Geoscience Ocean University of China Qingdao 266100 P. R. China Key Laboratory of Submarine Geosciences and Prospecting Techniques Ministry of Education Ocean University of ChinaQingdao 266100 P. R. China North China Sea Branch of the State Oceanic Administration Qingdao 266033 P. R. China Qingdao Institute of Marine Geology Qingdao 266071 P. R. China

Based on the measured data, suspended sediment concentration, surface sediment grain size, current and waves, the sediment transport mechanisms and pathways in the Phoenix Island area were analyzed using methods of flux decomposition and Grain Size Trend Analysis(GSTA). The results show that net suspended sediment is mainly transported by average current, Stokes drift, and gravitational circulation. The transport direction of suspended sediment is varying and basically following the direction of residual tidal currents. Surface sediment transport pathways are primarily parallel to the coastline along with two convergent centers. Waves and longshore currents have a significant influence on sediment transport, but the influence is limited due to a steep and deep underwater bank. Tidal current is the main controlling factor for sediment transport, especially in the deep water area. Neither suspended nor surface sediment is transported towards the southwest. The South Shandong Coastal Current(SSCC) has little effect on sediment transport processes in the nearshore area of Phoenix Island.

关键词： suspended Phoenix Island tidal currents Sediment convergent primarily Shandong underwater

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Recent geomorphic changes in the Liaohe Estuary

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Journal of Geographical Sciences 2010年第1期20卷 31-48页

作者： ZHU Longhai wu jianzheng XU Yongchen HU Rijun WANG Nan Key Lab of Submarine Geosciences and Prospecting Techniques Ministry of Education Ocean University of China Qingdao 266100 China College of Marine Geosciences Ocean University of China Qingdao 266100 Shandong China Engineering Survey and Design ＆ Development Institute Qingdao 266100 Shandong China

This paper mainly analyzes the geomorphological changes of the tidal deposition in the Liaohe Estuary based on the multi-year bathymetric charts in 1990, 1996, 2002 and 2005 and Landsat TM images in 1987, 1994, 2002 and 2005. Evolution of the tidal depositional system during the past 20 years in the Liaohe River was studied on the basis of 50 boreholes drilling and 30 km shallow stratigraphic exploration from 2002 to 2005. The main tidal depositional body of the modern Liaohe River delta is located in the Shuangtaizihe Estuary. The stratum within the depth of 10 m includes tidal bank facies, tidal channel facies and neritic facies with paleo-delta facies underlying them. The sediments of tidal bank facies are mainly composed of sand and silt with siltation load and suspended load of about 50% respectively in proportion. The sediment of tidal channel facies and neritic facies is composed of clayey silt and silty clay which belongs to suspended load. The study area was a small bay between the old Daliaohe River, the old Dalinghe River and the Raoyanghe River complex delta since the Holocene to 1896. Many tidal banks formed and expanded rapidly after the Shuangtaizihe River was excavated by labor in 1896. The runoff and sediment discharge have decreased since the construction of brake at the Shuangtaizihe River in *** Shuangtaizihe Estuary is in the state of deposition as a whole whose tidal bank is increasing and expanding south-ward, westward and northward. The maximum expansion speed is 87 to 683 m/a and the mean depositional rate is 0.189 m/a. Erosion occurred in some part of tidal bank with average erosional rate of 0.122 m/a. The tidal channel was filled up with sediment at a migration speed of 48-200 m/a. Geomorphologic changes have happened under the combined influ- ences of runoff, ocean dynamics and human activities. The main source of sediment changes from river sediment to sediment driven by tidal current and longshore current.

关键词： Liaohe River delta geomorphology

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Biobased Furfurylated Poplar Wood for Flame-Retardant Modification with Boric Acid and Ammonium Dihydrogen Phosphate

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Journal of Renewable Materials 2024年第8期12卷 1355-1368页

作者： Ming Ni Lei Li Yiqiang wu jianzheng Qiao Yan Qing Ping Li Yingfeng Zuo College of Materials Science and Engineering Central South University of Forestry and TechnologyChangsha410004China College of Furniture and Art Design Central South University of Forestry and TechnologyChangsha410004China

Furfurylated wood exhibits excellent dimensional stability and corrosion resistance,making it a promising material for constructing buildings,but it is highly ***,flame-retardant furfurylated poplar wood was produced via a two-step process utilizing boric acid(BA)and ammonium dihydrogen phosphate(ADP)as flame-retardant components,and biomass-derived furfuryl alcohol(FA)as a *** acidity of BA and ADP allowed them to catalyze the polymerization of FA,which formed a cross-linked network that immobilized BA and ADP inside the *** addition of BA/ADP substantially delayed the time to ignition from 10 to 385 s and reduced the total heat release and total smoke release by 58.75%and 77.31%,*** of the pyrolysis process showed that the decomposition products of BA and ADP protected the underlying furfurylated wood and diluted combustible *** method significantly improved the fire retardancy and smokeless properties of furfurylated wood,providing promising prospects for its application as an engineering material.

关键词： Poplar wood furfuryl alcohol furfurylated wood flame retardancy boric acid ammonium dihydrogen phosphate

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海南乐东陆架海底沙波形态特征及活动性研究

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海洋湖沼通报 2007年第B12期 53-59页

作者：王琳吴建政石巍中国海洋大学海洋地球科学学院青岛266100 山东省地矿工程勘察院济南250014

利用旁扫声呐、浅地层剖面、测深以及钻探等资料分析了海南岛乐东陆架区海底沙波的形态特征、底质及地层结构;分常态和台风作用两种环境条件。计算了沙波的移动速率.并与海南岛东方陆架区沙波特征进行了对比分析.研究表明:乐东陆架沙波... 详细信息

利用旁扫声呐、浅地层剖面、测深以及钻探等资料分析了海南岛乐东陆架区海底沙波的形态特征、底质及地层结构;分常态和台风作用两种环境条件。计算了沙波的移动速率.并与海南岛东方陆架区沙波特征进行了对比分析.研究表明:乐东陆架沙波以大型沙丘和小型沙波为主。其剖面都极不对称.沙丘多为新月形,波长多为50～100m,波高多为1～3m,对称系数在6～12之间;小型沙歧脊残多置直线型,波高多在0.1～0.5m之间.研究区沙波活动性较强,常态下迁移速率与东方沙波区西区相同,每年0.06～2m;在台风影响下,沙丘表面活动砂层的移动性增强,在活动砂体迁移的部位则可能出现冲蚀凹坑或沟槽;中小型沙波移动速率骤增,最大可达7～11m/h。

关键词：海南乐东沙波移动海底冲刷

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地方财政农业支出对农业产出的影响

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贵州农业科学 2013年第11期41卷 234-237页

作者：吴建征汪海洋河北大学河北保定071000 西北农林科技大学陕西杨凌712100

为了对区域农业产出水平和农业竞争力水平的可持续发展提供参考,对我国13个粮食主产省面板数据进行了显著性和贡献率分析.结果表明：地方财政农业支出对农业产出有显著影响,投入产出效率不高,投入产出弹性系数为0.160 891,地方财政农业... 详细信息

为了对区域农业产出水平和农业竞争力水平的可持续发展提供参考,对我国13个粮食主产省面板数据进行了显著性和贡献率分析.结果表明：地方财政农业支出对农业产出有显著影响,投入产出效率不高,投入产出弹性系数为0.160 891,地方财政农业支出的投入产出弹性较小;地方财政农业支出对粮食主产区农业产出的贡献率不高,1997-2004年和2004-2011年分别为35.56％和45.40％,不同粮食主产省份之间差别较大,河南、江苏、山东3省地方财政支农支出对农业产出的贡献率较大;不同粮食主产省有显著不同的农业发展禀赋,不同省份的农业产出自发性贡献率差异较大,在-20.43％～45.37％,1997-2004年和2004-2011年各粮食主产省平均农业产出自发性贡献率分别为21.79％和28.52％,以浙江和辽宁的自发性贡献率较高.另外,第一产业从业人员对农业产出有负向的显著影响,即第一产业从业人员对农业产出非但没有促进作用,反而对农业产出的增加有一定的抑制作用.

关键词：财政农业支出农业产出的贡献率农业产出自发性贡献率粮食主产省

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海岸沙坝横向迁移研究综述

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水科学进展 2016年第5期27卷 784-791页

作者：胡日军吴建政 PINGDong 马芳朱龙海中国海洋大学海洋地球科学学院山东青岛266100 中国海洋大学海底科学与探测技术教育部重点实验室山东青岛266100 School of Science and Engineering University of Dundee 国家海洋局北海分局北海监测中心山东青岛266033

沙坝是波浪作用下砂质海岸地貌的主要表现形态之一,对于海滩的动力稳定状态具有重要的指示意义。从沙坝的形态参数、沙坝形成理论、沙坝迁移的动力机制以及数值模拟方法等方面概述了水下沙坝横向迁移的研究进展和存在的不足。虽然国内... 详细信息

沙坝是波浪作用下砂质海岸地貌的主要表现形态之一,对于海滩的动力稳定状态具有重要的指示意义。从沙坝的形态参数、沙坝形成理论、沙坝迁移的动力机制以及数值模拟方法等方面概述了水下沙坝横向迁移的研究进展和存在的不足。虽然国内外学者对沙坝横向迁移进行了大量研究,然而由于海滩复杂的动力过程以及沙坝迁移与泥沙输运之间的耦合作用,目前仍存在许多问题尚待解决,未来进一步研究的方向主要包括沙坝迁移过程的空间差异、沙坝迁移的临界条件、波浪破碎对近底泥沙运动和沙坝迁移的影响、数学模型的改进以及沙坝迁移与泥沙输运的耦合机制等方面。

关键词：水下沙坝形态参数沙坝迁移动力机制数值模拟

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渤海湾北部表层沉积物的物理力学性质

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海洋地质动态 2011年第1期27卷 14-18页

作者：王凯吴建政安永宁吴宁中国海洋大学海洋地球科学学院青岛266100 胜利油田海洋钻井公司山东东营257000 交通运输部天津水运工程科学研究院天津300456

利用在渤海湾北部取得的大量海底表层样、原状箱式样和柱状岩心样品,通过现场十字板剪切试验和室内土工试验得出研究区海底表层土的各项物理力学性质和抗剪强度指标。研究表明,研究区的表层沉积物主要有砂—粉砂—黏土、黏土质粉砂、粉... 详细信息

利用在渤海湾北部取得的大量海底表层样、原状箱式样和柱状岩心样品,通过现场十字板剪切试验和室内土工试验得出研究区海底表层土的各项物理力学性质和抗剪强度指标。研究表明,研究区的表层沉积物主要有砂—粉砂—黏土、黏土质粉砂、粉砂、砂质粉砂、粉砂质砂、砂及砾砂7种。根据表层沉积物的不排水抗剪强度,发现研究区中部表层土的抗剪强度明显大于周边区域。

关键词：渤海湾北部十字板剪切物理力学性质不排水抗剪强度

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