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Physical oceanography measurements reveal a strong salinity (0.18 psu km−1) and temperature (0.07 °C km−1) front off the east coast of India in December 1997. T–S diagrams suggest lateral mixing between the fresh water at the coast and the ambient warmer, saltier water. This front seems to be the result of southward advection of fresh and cool water, formed in the northern Bay of Bengal during the monsoon, by the East Indian Coastal Current, as suggested by the large-scale salinity structure in the SODA re-analysis and the anti-cyclonic gyre in the northwestern Bay of Bengal during winter. The data further reveals an offshore front in January, which appears to be the result of a meso-scale re-circulation around an eddy, bringing cold and freshwater from the northern Bay of Bengal further away from the shore. Our cruise data hence illustrates that very strong salinity fronts can appear in the Bay of Bengal after the monsoon, as a result of intense coastal circulation and stirring by eddies.
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27.
Environmental impact assessment using FORM and groundwater system reliability concept: case study Jining, China 总被引:2,自引:0,他引:2
In this paper, fist-order reliability method (FORM) is used to evaluate the impacts of uncertainties posed by traditional
deterministic models on the environment in Jining, China. Because of groundwater contamination in shallow aquifer, and an
increase in water demand, the new wells target the confined aquifer with constant pumping rate of 5,000 m3/d. Using Theis equation, the groundwater drawdown is analyzed to determine whether the confined aquifer will be contaminated.
Although the piezometric level is higher than the phreatic level by 11.0 m, the risk of drawdown is still 19.49% when the
pumping rate of 5,000 m3/d is maintained for 2 years. The deterministic model indicates a drawdown of 8.94 m which is lower than the maximum tolerance
drawdown of 11.0 m. The sensitivity and uncertainty analysis reveal that the model result is more sensitive to transmissivity
than specific yield, while the reliability analysis offers significant information for the decision makers. This approach
exposes and minimizes the risk of undesirable consequences such as groundwater contamination. 相似文献
28.
The annual rainfall data of Athens rain gauge stations, for the last 119 years, is compared with the occurrence of large (M 6) earthquakes along the fault and thrust systems in the vicinity of Athens and interesting correlations have been observed.This preliminary investigation reveals the possible occurrence of a large earthquake in the region of Athens till 1993. 相似文献
29.
Panangattu Viswanathan Hareesh Kumar Basil Mathew Madathiparambil Ranganatha Ramesh Kumar Akula Raghunadha Rao Puvvala Surya Venkata Jagadeesh Kalarickal Gopalan Radhakrishnan Thiyyadi Nandakumar Shyni 《Ocean Dynamics》2013,63(11-12):1175-1180
Physical oceanography measurements reveal a strong salinity (0.18 psu km?1) and temperature (0.07 °C km?1) front off the east coast of India in December 1997. T–S diagrams suggest lateral mixing between the fresh water at the coast and the ambient warmer, saltier water. This front seems to be the result of southward advection of fresh and cool water, formed in the northern Bay of Bengal during the monsoon, by the East Indian Coastal Current, as suggested by the large-scale salinity structure in the SODA re-analysis and the anti-cyclonic gyre in the northwestern Bay of Bengal during winter. The data further reveals an offshore front in January, which appears to be the result of a meso-scale re-circulation around an eddy, bringing cold and freshwater from the northern Bay of Bengal further away from the shore. Our cruise data hence illustrates that very strong salinity fronts can appear in the Bay of Bengal after the monsoon, as a result of intense coastal circulation and stirring by eddies. 相似文献
30.
F Rolandone R Burgmann D C Agnew I A Johanson D C Templeton M A d'Alessio S J Titus C DeMets B Tikoff 周平博 《国际地震动态》2010,(6):39-40
太平洋板块与希拉内华达大峡谷微板块间的相对运动大多数是通过沿圣安德烈斯断层的走向滑动来调整的。在圣安德烈斯断层中部(CSAF),沿走向的滑动近于以无震断层蠕变的形式发生(Thatcher,1979;Titus等,2006;Rolandone等,2008;Ryder and Burgmann,2008)。 相似文献
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