Tidal Load and Salt Water Influences on Submarine Ground Water Discharge   总被引：3，自引：0，他引：3  

Ronald J. Paulsen  Daniel O'Rourke  Christopher F. Smith  Teng-Fong Wong 《Ground water》2004,42(7):990-999

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Effects of reaction kinetics and fluid drainage on the development of pore pressure excess in a dehydrating system   总被引：1，自引：0，他引：1  

Wei-Hau Wang  Teng-fong Wong 《Tectonophysics》2003,370(1-4):227-239

Fluid is released by dehydration reactions during prograde metamorphism. If the Claperyron slope for the dehydrating reaction is positive, then there is a net decrease in the total solid volume, which implies an irreversible increase in porosity. If the dilation of the pore space is insufficient to provide storage for all the released fluid, then pore pressure excess is generated, and if it becomes sufficiently high, it may lead to brittle fracturing. The time scale for pressure generation and the pore pressure excess can be maintained over long duration hinge on the interplay of reaction kinetics and fluid drainage. Motivated by experimental and microstructural observations, a hydrological model is developed that incorporates dehydration kinetics and its pressure dependence. Analytic solutions were derived for the undrained development of pore pressure. Whether lithostatic pressure may be exceeded hinges on magnitude of the overstep in temperature and corresponding equilibrium pressure. The time scale for development of pore pressure depends on the trade-off between poroelasticity and the pressure sensitivity of reaction rate. A finite difference model was also developed to simulate the progressive development of pore pressure excess, dehydration and porosity development. The model captures the experimental observation in gypsum of a reaction front that progressively propagates from the drained end toward the undrained end of a laboratory sample. It is also in reasonable agreement with experimental data on fluid drainage and porosity production.  相似文献   

Tropical Geography: Research and Reflections     

Carl Grundy-Warr  Shirlena Huang  P.P. Wong 《Singapore journal of tropical geography》2003,24(1):1-5

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An improved calibration method for the drift of the conductivity sensor on autonomous CTD profiling floats by θ–S climatology     

W. Brechner Owens  Annie P.S. Wong 《Deep Sea Research Part I: Oceanographic Research Papers》2009,56(3):450-457

An improved method to estimate the time-varying drift of measured conductivity from autonomous CTD profiling floats has been developed. This procedure extends previous methods developed by Wong, Johnson and Owens [2003. Delayed-mode calibration of autonomous CTD profiling float salinity data by θ–S climatology. Journal of Atmospheric and Oceanic Technology, 20, 308–318] and Böhme and Send [2005. Objective analyses of hydrographic data for referencing profiling float salinities in highly variable environments. Deep-Sea Research Part II, 52, 651–664]. It uses climatological salinity interpolated to the float positions and observed θ surfaces and chooses 10 ‘best’ levels that are within well-mixed mode waters or deep homogeneous water masses. A piece-wise linear fit is used to estimate the temporally varying multiplicative adjustment to the float potential conductivities. An objective, statistical method is used to choose the breakpoints in the float time series where there are multiple drift trends. In the previous methods these breakpoints were chosen subjectively by manually splitting the time series into separate segments over which the fits were made. Our statistical procedure reduces the subjectivity by providing an automated way for doing the piece-wise linear fit. Uncertainties in this predicted adjustment are estimated using a Monte-Carlo simulation. Examples of this new procedure as applied to two Argo floats are presented.  相似文献   

BEACH RESORT SITES ON THE EAST COAST OF PENINSULAR MALAYSIA     

P. P. Wong  M.A.  Ph.D. 《Singapore journal of tropical geography》1989,9(1):72-85

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Rethinking post-tsunami integrated coastal management for Asia-Pacific     

Poh Poh Wong 《Ocean & Coastal Management》2009,52(7):405-410

The December 2004 Indian Ocean tsunami wrought environmental damage beyond the normal framework of integrated coastal management and has implications for coastal management in Asia-Pacific in the post-tsunami phase. Fieldwork conducted on the coasts of four tsunami-affected countries in 2005 and 2006 identified several “practitioner-type” issues that would have implications for ICM policy. These include the loss of land with accompanying land tenure problems; the safety zone in conflict with the buffer zone; the need for better integration of livelihoods restoration with the rehabilitation of coastal ecosystems; and the inclusion of tsunami mitigation in the larger framework of climate change mitigation. A discussion of these issues and future role of ICM would provide a fresh perspective to policy-practice of ICM. A proposal is made to study various development pathways of selected coastal villages as they recovered in the post-tsunami phase.  相似文献   

LOCATIONAL CHARACTERISTICS OF FOREIGN EQUITY JOINT VENTURE INVESTMENT IN CHINA, 1979–1985     

Chi Kin Leung 《The Professional geographer》1990,42(4):403-421

An examination of the locational characteristics of intended foreign equity joint venture (EJV) investment in China during the period 1979 to 1985 indicates that foreign EJV investment was highly concentrated in the coastal region, in the more developed areas of the provinces, and in large cities. The locational characteristics, however, differed between economic sectors and between countries of origin of investment. Although foreign EJV investment became spatially more dispersed through time, the impacts on the development of inland regions and backward areas in China remained limited.  相似文献   

At Risk: Natural Hazards, People's Vulnerability and Disasters - by Ben Wisner, Piers Blaikie, Terry Cannon, and Ian Davis     

Norman Kin  -Wai Cheung 《The Geographical journal》2007,173(2):189-190

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Modeling population density across major US cities: a polycentric spatial regression approach   总被引：3，自引：0，他引：3  

Daniel A. Griffith  David W. Wong 《Journal of Geographical Systems》2007,9(1):53-75

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Particulate matter dispersion and haze occurrence potential studies at a local palm oil mill     

L. C. Abdullah Ph.D.  L. L. Wong M.Sc.  M. Saari Ph.D.  A. Salmiaton Ph.D.  M. S. Abdul Rashid Ph.D. 《International Journal of Environmental Science and Technology》2007,4(2):271-278

The emissions from palm oil industry through incineration and open burning are the major sources of air pollutions contribution in Malaysia. The consequence of increasing the particulate concentration, the particulate matter dissolves with vapour and grows into droplets when the humidity exceeds approximately 70% and causing opaque situation known as haze. This work focuses on the dispersion particulate matter from palm oil mill. Gaussian Plume Model from a point source, subject to various atmospheric conditions is used to calculate particulate matter concentration then display the distribution of plume dispersion using geographic information system. Atmospheric Stability, mixing height, wind direction, wind speed, natural and artificial features play an important role in dispersion process. Study on the dispersion of particulate matters and the haze potential are presented as a case study in this paper. The data obtained will be served as the purpose of modeling the transport of particulate matter for obtaining permits and prevention of significant deterioration to the environment.  相似文献