Soil Gas Volatile Organic Compound Concentration Contours for Locating Vadose Zone Nonaqueous Phase Liquid Contamination

Diffusion of VOC from cylindrical vadose zone domains contaminatedwith distributed nonaqueous phase liquid is examined in the steadystate approximation. The effects of first-order biodegradation and ofan extended underlying pool of LNAPL floating on the water table belowthe cylindrical domain are explored by means of an orthogonal functionsapproach. The distribution of VOC in the vadose zone above a floatingcircular LNAPL pool of finite size is explored by a numerical method.The results provide information useful in estimating the spacing anddepth at which soil gas samples should be taken in order to detect thepresence of such source areas. Comparison of model results with soilgas VOC measurements at various depths also provides insight into theextent to which natural biodegradation of the VOCs is taking place.     

Dissolved oxygen content as an index of water quality in San Vicente Bay,Chile (36 degrees 45'S)

The present report describes some effects of industrial and municipal effluents on the waters of San Vicente Bay. Analyses ofthe main substances contained in the fishing industry effluentsuggest rating criteria based on the oxygen saturation of thewater as an assessment of organic pollution. Six cruises were carried out throughout the Bay, from June to December 1996. Watersamples were analyzed for dissolved oxygen, oil and grease content, and sediment samples for organic matter content. Waterparameters (salinity, temperature) were used to characterize theBay's hydrography, and to calculate values for oxygen saturation. The measurements demonstrated a local broad range of oxygen deficit, with a maximum of 45% in the winter to 95% in the spring. In November more than 65% of the Bay's area showed oxygendeficits greater than 40%. Organic matter was unusually high insediments along the northern sector of the Bay. The results suggest that the oxygen depletion was a representative parameterfor establishing a relative scale of water quality in this Bay.     

塔城市奥布森生态区建设的效益分析及建议

通过介绍塔城市奥布森生态区建设及其产生效益的情况，提出了一些改善生态环境的建议，对塔城的社会经济与生态建设的可持续发展有一定的指导意义。     

战略环境评价理论与方法的初步探讨

以城市规划为对象 ,论述了对城市规划进行战略环境评价的目的意义 ,简述了国内外战略环境评价的进展情况 ,探讨了城市规划战略环境评价的基本内容、评价程序与技术方法     

一条正在发育的中、新生代裂谷带

沿长乐－南澳断裂带分布有非蛇绿岩型的镁铁、超镁铁质岩块；具中、新生代裂谷型岩浆组合；断裂两侧具有相似的变质岩基底及对应显著的地幔隆升地带。说明该断裂带为一条正在发育的中、新生代裂谷带。     

巷道围岩温度分布及调热圈半径的影响因素分析

分析了巷道壁面水分蒸发情况下通风时间、岩石的热物理性质、巷道几何尺寸、巷道风流与围岩壁面的对流换热系数、壁面湿度系数与风流相对湿度的变化对围岩温度分布及调热圈半径的影响。随着通风时间的延长 ,围岩冷却范围逐渐向围岩内部推移 ,推移速度逐渐降低 ;巷道壁面水分蒸发和风流相对湿度对靠近壁面处围岩温度分布影响很大 ,但对深部围岩温度分布的影响逐渐变小 ,所以对调热圈半径的影响很小 ;岩石导温系数对调热圈半径及其内部的温度分布影响较大。巷道壁面风流与围岩的换热系数和巷道的几何尺寸对巷道围岩的冷却范围影响非常小。     

Monitoring Environmental Changes in the Mediterranean Coastal Landscape: The Case of Cukurova, Turkey

This paper describes a remote sensing approach used to monitor temporal land use/cover (LULC) changes in Cukurova, an extensive coastal plain in the southeast Mediterranean coast of Turkey. The area has varied terrain ranging from low-lying alluvial deposits to rocky hills and mountains characterized by limestone outcrops. The ecological and economic importance of the area can be attributed to the existence of important coastal ecosystems (e.g., wetlands and sand dunes) and a wide range of industries located along the eastern coast. Temporal changes in the coastal landscape between 1984 and 2000 were evaluated using digital interpretation of remotely sensed satellite data. Pairwise comparison methods were used to quantify changes from 1984 to 1993 and 1993 to 2000 using multitemporal Landsat TM and ETM+ images, acquired in 1984, 1993, and 2000, respectively. Total change area was 2448 ha from 1984 to 1993 and increased more than twofold, to 6072 ha from 1993 to 2000. Change trends were determined using the information provided from individual change detection outputs of different periods. The most prominent changes were estimated to have occurred in agriculture, urban, and natural vegetation cover. Agriculture has increasingly grown over marginal areas, whereas urban development occurred at the expense of prime croplands across both time steps.     

浙江乐清湾海岸带地区的经济发展

海湾处于陆地和海洋交汇部位,由于开发环境优越,在人类社会发展中占有非常突出的地位.浙江乐清湾海岸带地区在经济迅速发展的同时,也面临着诸如淡水资源缺乏、海洋经济发展层次和城镇化水平偏低等问题.针对这些问题,提出了相应的调控对策和建议.     

粤港澳大湾区典型潮间带环境多介质中Cd形态空间分布特征及其影响因素

在粤港澳大湾区典型潮间带开展了 14个站位同步采样和观测,分析各采样点表水、孔隙水、悬浮物和沉积物中Cd形态的空间分布特征,并结合环境因子采用统计分析方法探讨不同介质中Cd形态分布差异的影响因素.结果表明,各潮间带环境表水、孔隙水、悬浮物和沉积物中Cd含量范围分别为0.41～15.03 μg·L-1、0.41～27.5...     

郯庐断裂带（安徽段）浅层地下水水化学特征、控制因素及水质评价

为研究郯庐断裂带（安徽段）地下水的水化学特征、控制因素和地下水质量.在郯庐断裂带周边的江淮波状平原区、沿江丘陵平原区和皖西山地共采集了86组地下水,综合运用描述性统计、Piper图、Gibbs图、离子比例分析、饱和指数、氯碱指数和熵权水质指数（EWQI）等方法,开展了地下水的水化学特征及控制因素研究,评价了地下水的质量.结果表明,郯庐断裂带（安徽段）周边浅层地下水呈弱碱性,地下水化学类型以HCO₃-Ca·Mg和HCO₃-Na·Ca型为主.水岩相互作用控制地下水化学组分的形成,硅酸盐岩和碳酸盐岩风化作用控制了地下水化学组分的形成.强烈的阳离子交替吸附作用是引起Na⁺富集的重要因素.研究区地下水整体质量较好,但受到一定程度人类活动的污染,江淮波状平原和沿江丘陵平原大部分地下水不适合直接饮用.研究结果对郯庐断裂带（安徽段）周边浅层地下水资源可持续开发利用和环境保护具有重要意义.