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排序方式: 共有74条查询结果,搜索用时 15 毫秒
11.
Observations of the change of water level in wells near the San Andreas fault in centra California indicate that there are pore-pressure changes associated with the process of fault creep. The sense of water-level and pore-pressure changes may indicate the direction of creep propagation. 相似文献
12.
Andrew R. McWilliam Nur Isiyana Wianti Yani Taufik 《Singapore journal of tropical geography》2021,42(1):132-148
Over recent decades, sustained economic growth in Indonesia has lifted many millions of Indonesians out of poverty. But despite these developments, 28 per cent of the population still live below the official poverty line and many more remain vulnerable to falling into poverty. Coastal and fishing communities represent some of the poorer populations across Indonesia, their livelihoods increasingly threatened by deleterious environmental impacts and overfishing. This paper draws on an analysis of household surveys from two Sama Bajo fishing settlements in coastal Southeast Sulawesi. A predominantly maritime language community, Sama Bajo livelihoods are shaped by seasonal patterns of fishing and marine based harvesting and trading. Using a modified poverty survey instrument, the paper explores comparative patterns of poverty and prosperity in these two communities with a focus on livelihood dynamics, seasonality effects, and the enduring patron‐client relationships that sustain their market‐oriented way of life. Key findings highlight the vulnerability of female headed households given the highly gendered access to fishing success, and the significance of relational co‐dependencies between patron‐client networks that sustain the current patterns of fishing livelihoods. The paper highlights the need for more focussed livelihood research among vulnerable populations in Indonesia and smallholder fishing communities in particular. 相似文献
13.
Ocean Dynamics - In this work, theoretical development of void fraction effect over wave energy dissipation and wave setup in a surf zone is made. The formulation incorporates simple energy... 相似文献
14.
The effect of calcium-based stabilizers such as lime on the geotechnical properties of tropical soils has been reported by
many researchers. However, the amount of literature available on the micro-structural, molecular, and leaching characteristics
of lime and in particular phosphoric acid-stabilized lateritic clays has been limited. This research was carried out in an
attempt to identify the time-dependent soil-chemical reactions. In addition, the possible mechanisms that contributed to the
stabilization process were discussed in the light of various spectroscopic and microscopic techniques such as X-ray diffractometry
(XRD), energy-dispersive X-ray spectrometry (EDAX), field emission scanning electron microscopy (FESEM), Fourier transform
infrared spectroscopy (FTIR), and nuclear magnetic resonance spectroscopy (NMR) etc. Based on the results it was found that
in lime-treated samples, the coating action of free iron oxides on clay particles imposed inhibitive effects on the dissolution
of clay alumina. On the other hand, in phosphoric acid-stabilized soil, due to the increase in solubility of metal oxides
and also the subsequent release of clay alumina the formation of cementitious compounds were more feasible. From engineering
point of view, the phosphoric acid-stabilized lateritic soil showed the highest degree of improvement with an approximately
threefold strength increase in comparison with the natural soil over an 8-month curing period. 相似文献
15.
This study presents a new geostatistical approach to characterization of the geometry and quality of a multilayer coal deposit using the data of seam thickness as a geometric property and the contents of ash, sodium, total sulphur, and the heating value as quality properties. A coal deposit in East Kalimantan (Borneo), Indonesia, which has a synclinal geological structure, was chosen as the study site. Semivariogram analysis clarified the strong dependence of heating value on ash content in the top and bottom parts of each seam and the existence of a strong correlation with sodium content over the sub-seams in the same location. The correlations between the geometry and quality of the seams were generally weak. A linear coregionalization model was used to derive the spatial correlation coefficients of two variables at each scale component from the single- and cross-semivariogram matrices. Because the data were correlated spatially in the same seam or over different seams, multivariate techniques (ordinary cokriging and factorial cokriging) were mainly used and the resultant spatial estimates were compared to those derived using a univariate technique (ordinary kriging). A factorial cokriging was effective to decompose the spatial correlation structures with different scales. Another important characteristic was that the sodium content shows distinct segregation: the low zones are concentrated near the boundary of the sedimentary basin, while the high zones are concentrated in the central part. The main component of sodium originates from the abundance of saline water. Therefore, it can be inferred that seawater had stronger effects on the coal depositional process in the central basin than in the border part. The geostatistical modeling results suggest that the thicknesses of all the major seams were controlled by the syncline structure, while the coal qualities chiefly were originated from the coal depositional and diagenetic processes. 相似文献
16.
Mohamed Saleh Efnik Samsuddin H. Taib Nur Islami 《Journal of the Geological Society of India》2016,88(6):736-742
In the past ten years, time-lapse (4D) seismic has evolved as a standard way of monitoring reservoir performance. The method is now being used as good reservoir management practice to provide evidence of saturation changes within the reservoir at field scale. 4D provides a new piece of data describing the dynamic behavior of the reservoir fluids between the wells, often limited to small scale monitoring at the borehole scale. Thus, it provides sophisticated techniques for reservoir monitoring and management relying on the integration of geological models, static and dynamic properties of the reservoir rock, and detailed production and pressure field data.While 4D seismic data has been very successful in monitoring hydrocarbon production from clastic reservoirs, this work has focused on implementing 4D time lapse to monitor saturation changes in carbonate reservoirs and it’s capability to be used as enhanced oil recovery (EOR) tool that can help in enhancing the recovery factor for the filed and help to locate new drilling to sweep more oil out of the reservoir and locate the by-pass oil.The principal goal of this research was to detect the maximum change in seismic attributes (amplitude, acoustic impedance, travel time) that could occur as a result of oil production, water and gas injection in carbonate reservoirs by using time-lapse 4D seismic. 相似文献
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19.
Mallick Javed Salam Roquia Amin Ruhul Islam Abu Reza Md. Towfiqul Islam Aznarul Siddik Md. Nur Alam Alam G. M. Monirul 《Natural Hazards》2022,112(2):1633-1656
Natural Hazards - Understanding household disaster risk perception is crucial to formulate and apply disaster risk reduction strategies. Using survey data from 300 households from three highly... 相似文献
20.
Volcanic gaps due to oblique consumption of aseismic ridges 总被引:1,自引:0,他引:1
The present-day consumption of oceanic ridges and other buoyant rises and fragments at circum-Pacific subduction zones, and presumably elsewhere, are closely related to existing gaps in volcanism. Examples are the gaps associated with the Nazca, Juan Fernandez, Cocos, Marcus-Necker and Louisville ridges. The buoyancy of these ridges breaks the continuity of the subducted plate, which may lead to reduced water supply required for melting of magma, and therefore create temporary volcanic gaps. The oblique consumption of these ridges causes the gap to migrate with time. This mechanism may be useful in interpreting time-space patterns of past volcanic chains associated with subduction in terms of the consumption of the disruptive oceanic plateaus and ridges. 相似文献