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Articles

by Meng Yuan, Yuwen Zhu, Ouyang Feng, Hui Zhao, Da Chen
80 Views, 0 PDF Downloads
The ingress - the harmful substance in the Marine Environment is main reason to cause The degradation to properties In the Marine Structures . This paperpresents a review , [about] on this effect of the The alkali -aggregate reaction on The Properties The structures under Marine environment from Four aspects, i . e . The influence factors to the alkali-aggregate Reaction expansion, The swelling behavior of alkali Aggregate reaction, chloride ion diffusion and chloride Ion binding behavior , this Mechanical properties damage and damage model under The combined action of " chloride ion and This Alkali- aggregate reaction . Also , The existing problemsin this study Field are analyzed . The new [a] ideas on the effect of alkali- Aggregate reaction on this Properties of of Structures under Marine Environment Are proposed. I , The new parameter must propose to more accurately Reflect material Damage degree under the alkali - Aggregate reaction. Second , The study on " Evolution of the long-term of the Mechanical properties under the combined action of The chloride ion, alkali-aggregate Reaction and Multi ­ dimensional stress needto Increase . Finally , The constitutive model of Concrete damage under three Axis
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Articles

by Congjiao Zhao, Bin Zhao, Yan Zhou
58 Views, 0 PDF Downloads
with the Implementation of Ocean developing strategy, as an Important part of Ecological civilization Construction the Construction to Marine ecologicalCivilization has become a national-level Strategy. Greendevelopmentwhichemphasizes The transformationof Traditionalma - rine Economic Development mode , Focusing on the protection of Marine Resources and Restoration of ecological Environment ? a New development model to Achieve economic , Social , resource and Environmental coordinated and sustainable Development . on-linemonitoring , , important tech­nical means to recognize this present situation to Marine Environment, ensure this construction to Marine ecological Civilization and the Green Development of Marine economy. This paper dis ­ cussed , connotation of Marine ecological Civilization and Green development,introduced Marine Ecologicalcivilization Demonstration areas and Marine Ecological redline Regions, Marine Remote Sensing monitoringand the Current Marine Environment on-line monitoringTechniques , suchas Marine Water quality Buoy , Marine Hydro-meteorological buoy, wave buoy, Tide station (Tidal bore ), HFGWR and Argo buoy. Construction to thre ^ dimensional , omnidirectional , Real-time On line  monitoring system To "shor ^ Sea-island , Sky-seasurfac^seabed" and "point-lin^surface Layer" were discussed. furthermore , promoting key Technologies of on-line monitoring and sup­porting service are on Aspectsso should do focused on in , future
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Articles

by Weishin S, Yi Yang, Dewei Hu
46 Views, 0 PDF Downloads

based on the noise mechanism of the marine environment and the research results of wind turn-off noise , proposed sea surface wind inversion using spaceborne microwave scattering meter field data for marine ambient noise analysis , and HY -2 A and ascat The correlation between the data and the noise spectral level is analyzed by contrast . Select South China Sea as research area , Using the noise data obtained by the latent-scale measurement system and the wind field data of the multi-source scattering meter, the relevant real check is implemented. and compare analysis with NCEP Sea Wind field data . results show ,ascat The correlation between data and noise is better than HY-2A , Scatter-meter data is better than NCEP Data , scattering meter wind field more suitable for analysis of marine environmental noise . This research expands the application field of the microwave Scatter meter wind field data , and provides better technical means for marine environmental noise Research .

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Articles

by Qiarrqian Bi, Jinzhou Du
44 Views, 0 PDF Downloads

Similar With the Other environments in this Earth ? s spheres, the natural and artifi­cial radionuclides are broadly Occurring in the Marine Environment. Since their^clock prop ­ erties With different time scales , The radionuclides play a significant role in Study of

Marine environmental processes . However , The radio-analysis in , Marine system is quite different from Other environments. It ? More challenging for some factors , Like Time

Consuming field work, theeffectof salinity on proceduresof Enrichment and separation. moreover , The Short half-lives nuclides , such as 224 Ra and 222 Rn , can Be only measured by the The shipboard Instruments . After summarizing the radio-analysis Procedures such as the seawater Sampling ,radiochemical * Enrichment and Purificationmethods, Measurement tech­niques ,we Extended to Their applications in Oceanography study. Finally , Future

Development To the [] radio-analytical technique and its application in the Marine Environment were prospected .
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Articles

by Peng Jiang, Jianheng Lin, Junping Sun, Shejuan Mi
64 Views, 0 PDF Downloads
taking into account that the depth distribution of noise sources in the marine environment is not concentrated , The establishes a noise model of the marine environment with the depth distribution of the noise source , The analyzes the source depth affects the vertical characteristics of the noise field and interprets it from a normal perspective , It is found that the submarine acoustic impedance and the depth of the source have significant effects on the ocean environment Noise . For the equivalent underwater reflection loss large sweep angle section , The further uses the model for inversion of the acoustic parameters . Two-segment measured noise data 200-525 Hz The inversion result of the band indicates that the : The inversion of the optimal value of acoustic parameters and sound propagation based on the marine ambient noise is similar to that of the AE. ; Source Average depth is optimal values decrease with frequency , It is indicated that the main contribution source of ambient noise with frequency is gradually changed from ship to Wave .; when sea condition is greater than 3 level , all Hz Above frequency band noise source depth average is very small , with Monahan The description of the bubble theory is consistent .
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