Chaoqi Zhu

Ocean University of China | OUC

Seabed fluid flow is a widespread and important natural phenomenon in marine environments, which involves complex multi-physics, multi-process and multi-scale processes. The developments in offshore geophysical technology have facilitated the discovery of the widespread emissions of seabed fluids. For an overview on the state-of-the-art seabed flui...

Knowledge of nepheloid layers is important to improve the understanding of physical, geological, and sedimentary processes from continental shelf to abyssal environments. We had not tried to study the nepheloid layers in a hydrate-associated tank until unexpected results occurred. Tank experimental results show that gas eruptions triggered intermed...

Internal solitary waves (ISWs) exert a significant influence on the deep-sea floor, yet little research has been conducted on their impact on benthic organisms. The objective of this study was to investigate the propagation characteristics of ISWs on the Shenhu continental slope in the northern South China Sea, as well as their mechanisms of influe...

The impact of gas hydrate dissociation on submarine landslides has become an increasingly significant issue. However, previous models cannot interpret the newly discovered non-conformity between the slide surface and the base of the gas hydrate stability zone. Here, the authors design an experimental approach for visualising fluid migration during...

Nuclear magnetic resonance (NMR) measurement could provide information during the formation and dissociation of gas hydrate on the pore structure properties which are of great important to understand the gas production behavior. In this study, the in-situ NMR and other well logging data achieved during the natural gas hydrate drilling program were...

Dear Colleagues, We are delighted to announce this Special Issue, entitled "Marine Geohazards: Characterization to Prediction", in the Journal of Marine Science and Engineering. This Special Issue aims to collate cutting-edge research and advancements in the field of marine geohazards. Marine environments present unique challenges for engineering...

Coastal dunes record the evolutionary process of coastal dynamic geomorphological systems, and provide valuable information on climate change, sea level changes, environmental evolution. These dunes are essential for global change research. In view of the dynamic changes in coastal dunes caused by extreme weather, coastal erosion and human activiti...

I am delighted to inform you that JMEE (Volume 11, Number 2) has recently published an exceptional paper by Xuguang Chen, the deserving recipient of the 2023 Outstanding Young Researcher Award. As announced officially, we have highlighted the 2023 award recipients both on the JMEE website and within the editorial of the 11.2 issue. I am particula...

The Marine Environmental Engineering Awards, established by the Journal of Marine Environmental Engineering (JMEE) and associated international academic organizations in 2023, aim to recognize the remarkable contributions of scientists and engineers to the marine environmental and engineering fields. The awards, comprising the Rising Star Award, Ou...

Journal of Marine Environmental Engineering (JMEE) is celebrating the 30th anniversary of publishing its first issue. Reflecting on 30 years of sharing high quality marine science and engineering research and scholarship with the world, we are overwhelmed by feelings of gratitude. Gratitude to the publishers, for recognizing that there was – and st...

Marine geohazards related to geological features and processes in coastal and offshore environments can cause damage to health, environment, field installations, or loss of life and assets. Given increasing human activities in marine environments and population density on coasts, threats to society from marine geohazards are serious. However, the u...

Seabed fluid migration is a critical process that involves the transport and movement of liquids, gases, and seawater within and outside the seabed, which has significant impacts on the genesis, development, and evolution of seabed geological disasters. Notably, typical disasters such as submarine landslides in the sea area of China demonstrate a s...

Marine carbon geological sequestration is crucial for achieving carbon peaking and carbon neutralization in China. However, there exist risks of carbon dioxide (CO2) leakage that leads to seabed geological disasters, severely threatening the safety of marine engineering. Therefore, it is of great practical significance to monitor the environmental...

The development of ocean resources and ocean engineering construction has gradually advanced into the deep sea. However, precise measurement of the shear strength of seabed sediments remains a challenge. To obtain the strength of seabed sediments, an in-situ device for testing the mechanical properties of seabed sediments has been developed. This d...

Many submarine landslides are associated with rapid sedimentation. However, relevant research on the contribution of rapid sedimentation to submarine landslides and its influencing factors is rare. Herein, the character of submarine landslides associated with rapid sedimentation was firstly summarized by analyzing relevant cases. Subsequently, the...

The occurrence of deep-sea geohazards is accompanied by dynamic changes in the physical properties of seafloor sediments. Therefore, studying the physical properties is helpful for monitoring and early warnings of deep-sea geohazards. Existing physical property inversion methods have problems regarding the poor inversion accuracy and limited applic...

Sediment dynamics describe the processes of the formation, distribution, and movement of sediments [...]

Journal of Marine Environmental Engineering (JMEE) is an international journal dedicated to publishing articles related to marine environmental engineering. Articles in JMEE are indexed by Ei Compendex, Scopus, etc. The journal is recruiting Associate Editors, Editorial Board Members, Youth Editorial Board Members and the their responsibilities in...

In situ observations of suspended sediment concentrations (SSCs), bed elevations, and concurrent hydrodynamics were conducted with an instrumented tripod on an abandoned lobe of the Yellow River Delta in the winter of 2014–2015. Four typical winter storms were recorded, but no significant local seabed erosion was observed at the observation site. N...

Earthquakes are the most frequent trigger for submarine landslides; thus, seismic instability evaluation of submarine slopes has received considerable attention. Previous studies have usually regarded earthquake response and post-earthquake stability assessment of submarine slopes as two separate procedures. However, earthquake response processes s...

The study of the physical and mechanical properties of marine soil is of great importance for marine geohazard prediction, submarine energy extraction, and submarine foundation design. In this study, a series of basic geotechnical tests and triaxial compression tests are performed on samples taken from the Shenhu sea area in the South China Sea (SC...

TMDs are widely used for gas sensing because it readily interacts with gas molecules. However, excessive electrical resistance and chemical instability prone to oxidation and moisture absorption limit its versatile applications. Here, we elucidate the unique inhomogeneous oxidation process of ultrathin SnS2 nanoflowers and demonstrate the novel gro...

Two-dimensional (2D) metal oxides semiconductor is considered as an important candidate material in the field of gas sensing. Here, fabrication of 2D ultra-thin mesoporous WO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> nanosheets (WO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns...

Gas hydrate dissociation may pose serious geohazards. The response of the seafloor to hydrate dissociation is important for geohazards, marine environments and global climate. We studied how hydrate dissociation affects underground temperature and pressure and how dissociation may lead to seafloor deformation. Here, we designed a laboratory model e...

Submarine landslides always occur along gently inclined continental slopes, but the reasons for such failure of low-angle submarine slopes are unclear and contentious. A short discussion is presented here to some recent published papers including some inspirations about the low-angle failure of submarine slopes. Because fluid overpressure could lea...

Variation of pore water pressure in soil grains, caused by the force of waves repeatedly acting on the seabed, is the main reason for soil liq-uefaction. In the study of wave-induced pore pressure response, field monitoring is closer to the real situation than other research methods. In this study, pore pressure in the easily liquefied zone of the...

Geological disasters of seabed instability are widely distributed in the Yellow River Delta, posing a serious threat to the safety of offshore oil platforms and submarine pipelines. Waves act as one of the main factors causing the frequent occurrence of instabilities in the region. In order to explore the soil failure mode and the law for pore pres...

Submarine landslides can be tremendous in scale. They are one of the most important processes for global sediment fluxes and tsunami generations. However, studies of prodigious submarine landslides remain insufficient. In this review paper, we compiled, summarized, and reanalyzed the results of previous studies. Based on this, we report the discove...

Volume change during natural gas hydrate dissociation is important for calculation of excess pore pressure and corresponding submarine slope stability. A short discussion is presented here to the paper of Wang et al including some notes about the standard condition and parameters used in their model. This discussion calls attention to the wrong use...

The South China Sea (SCS) is one of the most productive and accumulative marginal shelves of organic carbon in the world. To expound the transformation and preservation of organic carbon in the Northeast SCS, where abundant oil and gas resources have been reported, compound specific sterols in free (FR), base hydrolytic (BH), and acid hydrolytic (A...

The 2018 Indonesia tsunami was outsized compared with these tsunamigenic earthquakes, with the implication that some additional factors worsen the tsunami.

In order to explore the standing stock and preservation of organic carbon, different forms of compound specific lipids were analyzed, based on a 1.8 m sediment core collected in the northern continental shelf of South China Sea in May, 2016. In the core sediments, 21 species of fatty acids, 6 species of alcohols, 8 species of sterols and phytol wer...

In order to provide the academic and industry with a cost-effective cone penetration test (CPT) equipment with particular emphasis on testing in shoal water, we designed the shoal-water CPT equipment. The buoyancy system distinguishes the shoal-water CPT equipment from others. Before the test, the shoal-water CPT equipment can be towed by a small b...

The mechanical properties of sand are influenced by void ratio and compression pressure. Based on the sand critical state line characteristics, this paper describes the isotropic compression line by means of the linear relation in e-(p/pa) ξ space. A reference compression curve which is more suitable for describing the isotropic compression of sand...

Sediment suspended in the Yellow River delta provides significant physical, geological, and biogeochemical information. A time series of waves, currents, turbidities, temperatures, and tide levels were measured over a 134-d period using a submarine deployed tripod. A static model (multiple linear regression) and a dynamic model (superposed saw-toot...

In estuarine and coastal areas, the seabed is in a constant process of dynamic change under marine conditions. Seabed sediment erosion and resuspension are important processes that safely control the geological environment. Field tripod observations conducted in the Jiaozhou Bay in China are reported, to investigate the effects of hydrodynamic cond...

Free-fall CPT testing technology (FF-CPT) is one of the most important in-situ testing methods to determine strength of marine sediments. Based on a series of indoor and field tests, we developed a FF-CPT equipment used in deep water (1500 m). The FF-CPT system was composed of data acquisition unit, probe, counterweight, control module and releaser...

The dynamics of sediment erosion and deposition have been investigated in the Baisha Bay, China featured by a sandy bed. The wave elements, tide level, velocity and direction of the currents, seabed height change were measured by the underwater anti-subsidence in-situ tripod in December 2013. During the observations, the tripod installed with steel...

Chinese loess is unique in having great scientific value whilst also playing an important role in societal development. Large volumes of loess are continually carried by the Yellow River from the Chinese Loess Plateau to the Bohai Sea, northeast China, forming the Yellow River Delta. The physical and mechanical properties of this loess vary during...

Objective In geo-marine science, the generalized bottom boundary layer (BBL) represents a layer between the sediment and seawater. The BBL plays an important role in the geological, geobiochemical, geophysical and geotechnical research because it is the connection region of hydrosphere, geosphere and biosphere. Most previous studies on BBL are foc...

A scientific hypothesis is proposed and preliminarily verified in this paper: under the driving of seepage flows, there might be a vertical migration of fine-grained soil particles from interior to surface of seabed, which is defined as ‘sub-bottom sediment pump action’ in this paper. Field experiments were performed twice on the intertidal flat of...

随着海洋开发活动由浅海走向深海，南海北部陆坡的沉积物强度特性逐渐成为关注热点。本文通过参与2015年与2016年共享航次计划，在南海北部莺琼陆坡、神狐陆坡、东沙陆坡、台湾浅滩陆坡进行沉积物重力取样与箱式取样，并现场剖样，用以进行沉积物强度测试。地质取样结果表明东沙陆坡砂含量相对较高并发现直径约22cm黑色气孔状碳酸盐结核。在神狐陆坡沉积物表层发现活体壳类生物，在110cm深度处发现壳类生物遗骸。十字板剪切试验与笔式贯入试验结果表明南海北部陆坡，沉积物强度差异较大。但总体而言，除东沙陆坡外，莺琼陆坡、神狐陆坡、台湾浅滩陆坡表层沉积物强度一般较低。0～20cm范围内，笔式贯入阻力一般小于0.1N，十字板剪切强度最大一般不超过10kPa。0～300cm深度范围内，沉积物强度沿深度方向大致呈递增趋势...

黄河流经黄土高原携带巨量泥沙入海，并在河口沉积形成黄河水下三角洲。黄土沿黄河流域自西北高原迁移至东部渤海的过程中，其工程性质必然也会发生相应变化。归纳总结近30年来黄河流域地区黄土研究资料，统计不同区域黄土的物理性质、成分、结构特征、力学性质与动力特性，分析黄土从黄土高原到东部渤海发生的变迁。研究结果显示在迁移入海的过程中黄土的容重、含水量变大，可塑性减弱；主要成分仍为粉粒，但黏粒含量增加，砂粒含量减小，于此同时，黄土孔隙也被更好地充填，结构由疏松变紧密，压缩性相应减弱；黄土的抗剪性区域性变化，而抗震性和抗液化强度变大。本研究对深入理解黄土地质灾害机理、科学指导黄土地区工程建设具有重要意义。

With offshore resource exploration moving to the deep water, marine geohazards have been attracting attention from the academic and industry. Research achievements of marine geohazards were reviewed in this paper. We analyzed and discussed typical issues among marine geohazards, including coastal erosion, submarine slope failure, turbidity current...

Due to the perniciousness and universality of the submarine landslide, it has been attracting increasing attention in the world as a hot issue. In order to deepen the understanding of the submarine landslide, the classification of categories and the genetic mechanism were discussed by systematically analyzing the domestic and international research...

海底滑坡危害严重且普遍存在,成为人们日益关注的热点问题。为加深对其认识,从范畴分类、成因机制两方面进行论述分析,对国内外的研究成果进行提炼总结,并重点分析了水动力与天然气水合物分解两种触发机制。结果表明海底滑坡内涵逐步深化、类型逐步细化、范畴逐步泛化;海底滑坡的最终形成是在一定内在条件下,多种触发因素共同作用的结果,其成因机制异常复杂。最后指出了海底滑坡未来的研究方向与工作重点:发展原位实时监测技术,建立海底滑坡资料数据库,完善物理-数值模型。

This paper was aimed to study the ultimate bearing capacity and the parameter selection method of the neoteric U-shaped Confined Concrete (UCC) arch centering in mine with the help of Abaqus for numerical simulation and Matlab for data analysis. The influence of the sealing plate and concrete on the axial ultimate bearing capacity and material cost...