Further study of synoptic variability in Wakasa Bay, Japan     

Shin-ichiro Umatani  Noriaki Masunaga  Toshio Yamagata 《Progress in Oceanography》1986,17(3-4)

Observations of synoptic variability from CTD and current meter measurements in Wakasa Bay, Japan in summer of 1980 and 1981 are compared with the results of 1979 reported by Yamagata, Umatani, Masunaga and Matsuura (1984). It is suggested that the speed and direction of propagation can basically be explained in terms of shelf wave dynamics.In the 1980 event, a dense (colder and more saline) water advanced eastward along the north coast at about 10 km day⁻¹. The lateral scale of the phenomenon was about 30 to 40 km, in agreement with the Rossby internal radius of deformation. The T-S and current data suggest that the 1980 cold event was dominated by phase propagation. In the 1981 event, a light (warmer and less saline) water area advanced eastward at the speed similar to the 1980 cold event, but the T-S and current data suggest that Lagrangian drift of water particles associated with strong eddy motions was not negligible.  相似文献   

The circulation in the southern Huanghai Sea and northern East China Sea in June 1999   总被引：1，自引：0，他引：1  

Yaochu Yuan  Yonggang Liu  Mingyu Zhou  Arata Kaneko  Zhou Yuan  Noriaki Gohda 《海洋学报(英文版)》2003,22(3):321-332

On the basis of hydrographic data and current measurement (the mooring system, vessel-mounted ADCP and toward ADCP) data obtained in June 1999, the circulations in the southern Huang-hai Sea (HS) and northern East China Sea (ECS) are computed by using the modified inverse method. The Kuroshio flows northeastward through eastern part of the investigated region and has the main core at Section PN, a northward flow at the easternmost part of Section PN, a weaker anti-cyclonic eddy between these two northward flows, and a weak cyclonic eddy at the western part of Section PN. The above current structure is one type of the current structures at Section PN in ECS. The net northward volume transport (VT) of the Kuroshio and the offshore branch of Taiwan Warm Current (TWCOB) through Section PN is about 26.2×106m3/s in June 1999. The VT of the inshore branch of Taiwan Warm Current (TWCIB) through the investigated region is about 0.4×106m3/s. The Taiwan Warm Current (TWC) has much effect on the currents over the  相似文献   

A Continuous Mapping of Tidal Current Structures in the Kanmon Strait   总被引：1，自引：0，他引：1  

Keisuke?Yamaguchi  Ju?Lin  Arata?KanekoEmail author  Tokuo?Yayamoto  Noriaki?Gohda  Hong-Quang?Nguyen  Hong?Zheng 《Journal of Oceanography》2005,61(2):283-294

Tidal current structures at the Hayatomono-Seto of the Kanmon Strait are mapped continuously during March 17 to 20, 2003, including a spring tide, by the eight coastal acoustic tomography (CAT) systems distributed on both the sides of the strait. Detailed structures of strong tidal currents and their associated vortices are well reconstructed by the inverse analysis of travel-time difference data obtained from the reciprocal sound transmission between the paired CAT systems located at both sides of the strait mainly. The results are well compared to the shipboard acoustic Doppler current profiler (ADCP) data at the correlation rate of 0.84/0.82 and the RMS difference of 0.47/0.48 ms⁻¹ for the east-west/north-south current after the selection of good data. During the observation period, the maximum hourly mean volume transport for the upper 7 m layer across the strait reached 13,314 m³ s⁻¹ for the eastward and 5,547 m³ s⁻¹ for the westward. The daily mean transport is directed to the eastward and estimated 1,470 m³ s⁻¹ and 2,140 m³ s⁻¹ for March 18 and 19, respectively, when a spring tide occurs.  相似文献   

A simple estimation model for basal heave stability of braced excavations in anisotropic clay     

Zhang  Runhong  Goh  Anthony Teck Chee  Li  Yongqin  Liu  Hanlong  Wang  Lin  Chen  Zhixiong  Zhang  Wengang 《Acta Geotechnica》2022,17(12):5789-5800

Acta Geotechnica - The basal heave stability of the excavation and support system is a major concern to geotechnical design engineers, particularly in soft clay deposits. Conventional methods for...  相似文献   

ENVIRONMENTAL MANAGEMENT     

Goh Kim Chuan  Ph.D. 《Singapore journal of tropical geography》1993,13(1):14-24

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HYDROLOGICAL CHARACTERISTICS AND WATER RESOURCES     

Goh Kim Chuan  Ph.D. 《Singapore journal of tropical geography》1993,13(1):25-37

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PREFACE     

Goh Kim Chuan 《Singapore journal of tropical geography》1993,13(1):i-i

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Hydrological Studies and Water Resource Concerns in Southeast Asia   总被引：1，自引：0，他引：1  

Goh Kim Chuan 《Singapore journal of tropical geography》2003,24(1):86-110

Water supply shortage has become a pressing issue in Southeast Asia in recent years. While on the one hand water demand is escalating with rapid economic development, urbanisation and related population concentrations, on the other, surface water supply sources are increasingly being threatened by the resultant land use changes. Therefore, any understanding of the region's water supply concerns necessarily takes into account the hydrological processes and changes consequent to human interference of the natural environment. Changes to the environment that curtail the quantity of water supply and affect its quality will in turn have implications for water resource issues in megacities and other urban areas. Equally critical to the supply of water are water resource and management issues, in particular, the adequate provision of safe water for human consumption, regarded as not only meeting a basic need but also a human right. This paper provides an overview of hydrological processes and water resource concerns and suggests the scope for further investigation, particularly by geographers.  相似文献   

A simple relationship for crenulate-shaped bay in static equilibrium     

Zhi-Qian Wang  Soon-Keat Tan  Nian-Sheng Cheng  Keng-Wee Goh 《Coastal Engineering》2008

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The oxidation states of copper and iron in mineral sulfides, and the oxides formed on initial exposure of chalcopyrite and bornite to air     

Siew Wei Goh  Robert N. Lamb  Damian Moran 《Geochimica et cosmochimica acta》2006,70(9):2210-2228

Metal L_2,3, sulfur K and oxygen K near-edge X-ray absorption fine structure (NEXAFS) spectra for chalcopyrite, bornite, chalcocite, covellite, pyrrhotite and pyrite have been determined from single-piece natural mineral specimens in order to assess claims that chalcopyrite should be regarded as Cu^IIFe^IIS₂ rather than Cu^IFe^IIIS₂, and that copper oxide species are the principal initial oxidation products on chalcopyrite and bornite exposed to air. Spectra were obtained using both fluorescence and electron yields to obtain information representative of the bulk as well as the surface. Where appropriate, NEXAFS spectra have been interpreted by comparison with the densities of unfilled states and simulated spectra derived from ab initio calculations using primarily the FEFF8 code and to a lesser extent WIEN2k. Metal 2p and S 2p photoelectron spectra excited by monochromatised Al K_α X-rays were determined for each of the surfaces characterised by NEXAFS spectroscopy. The X-ray excited Cu LMM Auger spectrum was also determined for each copper-containing sulfide. FEFF8 calculations were able to simulate the experimental NEXAFS spectra quite well in most cases. For covellite and chalcocite, it was found that FEFF8 did not provide a good simulation of the Cu L₃-edge spectra, but WIEN2k simulations were in close agreement with the experimental spectra. Largely on the basis of these simulations, it was concluded that there was no convincing evidence for chalcopyrite to be represented as Cu^IIFe^IIS₂, and no strong argument for some of the Cu in either bornite or covellite to be regarded as Cu(II). The ab initio calculations for chalcopyrite and bornite indicated that the density of Cu d-states immediately above the Fermi level was sufficient to account for the Cu L₃-edge absorption spectrum, however these incompletely filled Cu d-states should not be interpreted as indicating some Cu(II) in the sulfide structure. It was also concluded that the X-ray absorption spectra were quite consistent with the initial oxidation products on chalcopyrite and bornite surfaces being iron oxide species, and inconsistent with the concomitant formation of copper-oxygen species.  相似文献