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41.
Niimi AJ 《Environmental management》2004,33(5):712-718
The effects of global warming can increase the risk of exotic species introductions in eastern Canadian Arctic waters by reducing surface ice cover and allow increased access to commercial vessels. Ballast water discharged by incoming overseas vessels is an important means for introducing species on a global scale. Analyses of air temperatures at Churchill, Manitoba between 1943 and 2002 indicated an increase in mean temperature within the past decade. Churchill is the only major northern port in this region where grain has been exported on a limited basis due to the short navigation season. Economic analyses of grain exported from Canadian and U.S. ports indicated some cost advantages for using northern ports. The Hudson Bay region is vulnerable to increased exotic species introductions because of its southerly location. Current ballast water exchange measures to reduce the risk of introductions may not be effective because most vessels enter the region with ballast, and the ballast exchange zone is located relatively close to coastal areas where the habitat could be favorable for an introduced species to become established. The probability of a large crab species introduced to this region from northern European waters is discussed. The risk of ballast water–related exotic species introduction to this region may be reduced by expanding the types of cargo handled and developing a strong import market. This approach would accommodate an increase in the number of vessels with cargo, and substantially reduce the volume of ballast carried to this region. 相似文献
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Altman's (1977) theory of privacy as a cultural universal is examined by analyzing the privacy mechanisms of the Iban of Sarawak (Borneo). The Sarawak Dayaks live in communal longhouses which appear to offer little physical opportunity for individual privacy. However, the authors found that social mechanisms were utilized to obtain privacy. Thus, despite the communal physical environment of the Sarawak Iban, support is found for a system of privacy. The implications of these findings for other cultures and settings where the physical environment appears to limit control of privacy is discussed. 相似文献
44.
Michael V. Martin Louise M. Arthur 《Journal of the American Water Resources Association》1982,18(3):481-484
ABSTRACT: The period of time from identification of a possibly desirable inland waterway transportation project to its actual implementation has been observed to be inordinately long. It is Hypothesized that at Least one cause of delays in project approval and implementation is a analytical credibility associated with project feasibility analysis conducted by the U.S. Army Corps of Engineers. This paper examines this hypothesis in terms of the proposal to construct a new, expanded lock at the Bonneville Dam on the Columbia River. The principle finding is that the analysis conducted by the Corps is conceptually flawed, methodologically questionable, internally inconsistant, and inappropriately narrow in scope. 相似文献
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Albert Rango Arthur T. Anderson 《Journal of the American Water Resources Association》1974,10(5):1060-1081
ABSTRACT. The Spring 1973 Mississippi River flood was investigated using remotely sensed data from ERTS-1. Both manual and automatic analyses of the data indicate that ERTS-I is extremely useful as a regional tool for flood management. Quantitative estimates of area flooded were made in St. Charles County, Missouri and Arkansas. Flood hazard mapping was conducted in three study areas along the Mississippi River using pre-flood ERTS-1 imagery enlarged to 1:250,000 and 1:100,000 scale. The flood prone areas delineated on these maps correspond to areas that would be inundated by significant flooding (approximately the 100 year flood). The flood prone area boundaries were generally in agreement with flood hazard maps produced by the U. S. Army Corps of Engineers and U. S. Geological Survey although the latter are somewhat more detailed because of their larger scale. Initial results indicate that ERTS-1 digital mapping of flood prone areas can be performed at 1:62,500 which is comparable to some conventional flood hazard map scales. 相似文献
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