期刊文献+
共找到12篇文章
< 1 >
每页显示 20 50 100
Structure and Temporal Variability of Mediterranean Water in Hydrological and Marine Seismic Data South of Portimao Canyon (Gulf of Cadiz), from 1999 to 2002
1
作者 Elise Quentel Xavier Carton Marc Andre Gutscher 《International Journal of Geosciences》 2011年第3期185-194,共10页
Hydrological and marine seismic data, collected in the Gulf of Cadiz (respectively in July 1999, 2000, 2001 and 2002, and in April 2000 and 2001) are analysed to reveal the various structures of Mediterranean Water (M... Hydrological and marine seismic data, collected in the Gulf of Cadiz (respectively in July 1999, 2000, 2001 and 2002, and in April 2000 and 2001) are analysed to reveal the various structures of Mediterranean Water (MW). Both the hydrological and seismic data clearly identify the MW undercurrents on the Iberian slope, detached MW eddies (meddies and a cyclone) and smaller fragments of MW (filaments and small eddies). Seismic reflectivity and synthetic reflectivity computed from hydrology, indicate that strong acoustic reflectors, associated with 8 - 64 m thick homogeneous water layers, are found above and below meddies and filaments, around the MW undercurrents, but mostly in the lower part of cyclones and below submesoscale eddies. Reflectors are also observed in the near surface layers where thermohaline contrasts are quite pronounced. The successful use of seismic data to locate submesoscale MW structures, superior to that of hydrology, is related to the improved horizontal resolution. 展开更多
关键词 mediterranean water EDDIES Undercurrent LAYERING HYDROLOGICAL Data Seismic Reflectivity SUBMESOSCALE Structures
下载PDF
Cereal-forage crop rotations and irrigation treatment effect on water use efficiency and crops sustainability in Mediterranean environment
2
作者 Pasquale Martiniello 《Agricultural Sciences》 2012年第1期44-57,共14页
Agricultural systems based on crop rotations favour sustainability of cultivation and productivity of the crops. Wheat-forage crops rotations (annual winter binary mixture and perennial alfalfa meadow) combined with i... Agricultural systems based on crop rotations favour sustainability of cultivation and productivity of the crops. Wheat-forage crops rotations (annual winter binary mixture and perennial alfalfa meadow) combined with irrigation are the agronomical techniques able to better exploit the weather resources in Mediterranean environments. The experiment aimed to study the effect of 18 years of combined effect of irrigation and continuous durum wheat and wheat-forage rotations on productivities of crops and organic matter of topsoil. The experiments were established through 1991-2008 under rainfed and irrigated treatments and emphasized on the effect of irrigation and continuous wheat and wheat-forage crop rotations on water use efficiency and sustainability of organic matter. The effect of irrigation increased 49.1% and 66.9% the dry matter of mixture and meadow, respectively. Continuous wheat rotation reduced seed yield, stability of production, crude protein characteristics of kernel and soil organic matter. The yearly gain in wheat after forage crops was 0.04 t (ha·yr)-1 under rainfed and 0.07 t (ha·yr)-1 under irrigation treatments. The crude protein and soil organic matter of wheat rotations, compared to those of continuous wheat under rainfed and irrigated was increase in term of point percentage by 0.8 and 0.5 in crude protein and 5.1 and 4.4 in organic matter, respectively. The rotations of mixture and meadow under both irrigated treatments increased the point of percentage of organic matter over continuous wheat (9.3.and 8.5 in mixture and 12.5 and 9.5 meadow under rainfed and irrigation, respectively). Irrigation reduce the impact of weather on crop growing reducing water use efficiency (mean over rotations) for dry mater production (15.5 in meadow and 17.5 in mixture [L water (kg·dry·matter)-1 ]) and wheat seed yield. The effect of agronomic advantages achieved by forage crops in topsoil expire its effect after three years of continuous wheat rotation. 展开更多
关键词 Alfalfa Binary Mixture DURUM WHEAT IRRIGATION mediterranean Environment Soil Organic Matter water Use Efficiency Wheat-Forage ROTATIONS
下载PDF
Hydrological Structure, Circulation and Water Mass Transport in the Gulf of Cadiz 被引量:1
3
作者 Jose Miguel Rodrigues Alves Xavier Carton Isabel Ambar 《International Journal of Geosciences》 2011年第4期432-456,共25页
Hydrological and LADCP data from four experiments at sea (Semane 1999, 2000/1 2000/3, 2001) are used to describe the structure and circulation of Mediterranean Water in the Gulf of Cadiz. These data were gathered on m... Hydrological and LADCP data from four experiments at sea (Semane 1999, 2000/1 2000/3, 2001) are used to describe the structure and circulation of Mediterranean Water in the Gulf of Cadiz. These data were gathered on meridional sections along 8?20′W and 6?15′W and between these longitudes on a zonal section along 35?50′N. The mesoscale and the submesoscale structures (Mediterranean Water Undercurrents, meddies, cyclones) observed along these sections are characterized in terms of thermohaline properties and of velocity. The transports of mass and salt in each class of density (North Atlantic Central Water, Mediterranean Water, North Atlantic Deep Water) are computed with an inverse model. The model indicates a general eastward flux in the Central Water layer, and a westward flux in the Mediterranean Water layer, but there is also a horizontal recirculation and entrainment in these two layers, as well as strong transports associated with the meddy and cyclone found during Semane 1999. 展开更多
关键词 mediterranean water GULF of Cadiz HYDROLOGY water MASSES Regional Scale CIRCULATION Inverse Model TRANSPORT
下载PDF
Possibilities of Using Solar Energy in District Cooling Systems in the Mediterranean Region 被引量:3
4
作者 John Vourdoubas 《Open Journal of Energy Efficiency》 2019年第2期21-34,共14页
Use of district heating and cooling systems has many environmental advantages compared to individual heating and cooling. Recent advances in solar energy technologies for heat and power generation have reduced their c... Use of district heating and cooling systems has many environmental advantages compared to individual heating and cooling. Recent advances in solar energy technologies for heat and power generation have reduced their cost and promoted their use instead of fossil fuels. Solar-PV energy for electricity generation and solar thermal energy for hot water production are broadly used today. Solar energy resources in the Mediterranean region are abundant while space cooling in buildings is required when solar irradiance is high. The possibility of using solar energy for fuelling water chillers providing cold water in district cooling systems in the Mediterranean basin has been investigated. Existing literature and studies concerning the use of district cooling systems globally as well as the energy sources used in them have been examined. Solar-PV energy combined with compression chillers and solar thermal energy combined with thermally driven chillers can be used for cold water production. Their overall efficiencies, converting solar energy to cold water, vary between 22% and 56% compared with 45% for compression chillers using grid electricity. It is concluded that various solar energy technologies could be used with different types of water chillers for fuelling district cooling networks in the future in the Mediterranean region. 展开更多
关键词 DISTRICT COOLING EFFICIENCY mediterranean REGION SOLAR Energy water Chillers
下载PDF
Changes in foliar carbon isotope composition and seasonal stomatal conductance reveal adaptive traits in Mediterranean coppices affected by drought 被引量:2
5
作者 Giovanni Di Matteo Luigi Perini +5 位作者 Paolo Atzori Paolo De Angelis Tiziano Mei Giada Bertini Gianfranco Fabbio Giuseppe Scarascia Mugnozza 《Journal of Forestry Research》 SCIE CAS CSCD 2014年第4期839-845,共7页
We estimated water-use efficiency and potential photosyn- thetic assimilation of Holm oak (Quercus ilex L.) on slopes of NW and SW aspects in a replicated field test examining the effects of intensifying drought in ... We estimated water-use efficiency and potential photosyn- thetic assimilation of Holm oak (Quercus ilex L.) on slopes of NW and SW aspects in a replicated field test examining the effects of intensifying drought in two Mediterranean coppice forests. We used standard tech- niques for quantifying gas exchange and carbon isotopes in leaves and analyzed total chlorophyll, carotenoids and nitrogen in leaves collected from Mediterranean forests managed under the coppice system. We pos- tulated that responses to drought of coppiced trees would lead to differ- ential responses in physiological traits and that these traits could be used by foresters to adapt to predicted warming and drying in the Mediterra- nean area. We observed physiological responses of the eoppiced trees that suggested acclimation in photosynthetic potential and water-use effi- ciency: (1) a significant reduction in stomatal conductance (p〈0.01) wasrecorded as the drought increased at the SW site; (2) foliar 813C increased as drought increased at the SW site (p〈0.01); (3) variations in levels of carotenoids and foliar nitrogen, and differences in foliar morphology were recorded, and were tentatively attributed to variation in photosyn- thetic assimilation between sites. These findings increase knowledge of the capacity for acclimation of managed forests in the Mediterranean region of Europe. 展开更多
关键词 mediterranean forest ecosystems forest acclimation stableisotopes leaf gas exchanges water-use efficiency foliar traits adaptivesilviculture.
下载PDF
地中海水牛人工授精效果研究 被引量:2
6
作者 覃广胜 杨炳壮 +3 位作者 谭正准 李辉 黄健 梁贤威 《中国牛业科学》 2010年第5期33-35,共3页
[目的]为了解意大利地中海水牛冻精的授精效果及其在我国生长适应情况。[方法]利用国内首次引进意大利地中海水牛冻精与我国现有的摩拉、尼里——拉菲和本地水牛进行人工授精,试验选取自然发情的摩拉水牛20头,尼里水牛16头,本地水牛32头... [目的]为了解意大利地中海水牛冻精的授精效果及其在我国生长适应情况。[方法]利用国内首次引进意大利地中海水牛冻精与我国现有的摩拉、尼里——拉菲和本地水牛进行人工授精,试验选取自然发情的摩拉水牛20头,尼里水牛16头,本地水牛32头,年龄在2.5~9岁之间,采用直肠把握子宫角深部输精法,配种后40 d应用B超进行早期妊娠诊断怀孕情况。[结果]:摩拉、尼里——拉菲和本地水牛受胎率分别为50.00%、75.00%、56.25%,平均人工授精配种受胎率为58.82%,品种间人工授精受胎率差异不显著(P〉0.1)。[结论]表明引进地中海水牛冻精开展杂交组合,改良我国现有的水牛品种,提高其生产性能是切实可行的。 展开更多
关键词 地中海水牛 冻精 人工授精 受胎率
下载PDF
东地中海深水油气富集条件与勘探方向 被引量:4
7
作者 田琨 王大鹏 +1 位作者 殷进垠 郭金瑞 《中国石油勘探》 CAS CSCD 北大核心 2021年第3期107-116,共10页
东地中海油气资源丰富、勘探程度低,是近年全球深水油气勘探热点地区之一。东地中海深水油气富集条件研究对该地区油气勘探选区选带具有指导意义。基于国际油气商业数据库和地质地球物理资料,应用石油地质综合研究方法,对东地中海构造... 东地中海油气资源丰富、勘探程度低,是近年全球深水油气勘探热点地区之一。东地中海深水油气富集条件研究对该地区油气勘探选区选带具有指导意义。基于国际油气商业数据库和地质地球物理资料,应用石油地质综合研究方法,对东地中海构造沉积演化、油气地质条件、储盖组合及成藏特征进行分析,进而探讨深水油气富集条件及未来勘探方向。研究结果表明,东地中海发育中新统生物礁灰岩+盐岩、中新统浊积砂岩+盐岩主力储盖组合及白垩系浊积砂岩+泥页岩、侏罗系生物礁灰岩+泥灰岩推测储盖组合。厚层渐新统—中新统海相烃源岩、优质中新统盆底扇浊积砂岩和生物礁灰岩储层、区域性盐岩盖层及构造反转期发育的大型构造圈闭控制了东地中海深水油气富集。未来应重点关注黎凡特盆地深水区中新统浊积砂岩领域和埃拉托色尼台地周缘中新统生物礁灰岩领域,深入探索希罗多德盆地深水区中新统浊积砂岩领域和黎凡特盆地中生界深层领域。 展开更多
关键词 储盖组合 油气富集 勘探方向 深水 东地中海
下载PDF
东地中海黎凡特盆地构造特征与油气勘探 被引量:16
8
作者 刘小兵 张光亚 +4 位作者 温志新 王兆明 宋成鹏 贺正军 李治平 《石油勘探与开发》 SCIE EI CAS CSCD 北大核心 2017年第4期540-548,共9页
基于东地中海黎凡特盆地地质、地震等资料,恢复主要地质时期原型盆地及岩相古地理,开展盆地构造特征对比分析,并结合已发现气藏特征解剖,建立成藏模式,探讨该区有利成藏组合及下一步勘探方向。黎凡特盆地主要发育有早期断层、中期断层... 基于东地中海黎凡特盆地地质、地震等资料,恢复主要地质时期原型盆地及岩相古地理,开展盆地构造特征对比分析,并结合已发现气藏特征解剖,建立成藏模式,探讨该区有利成藏组合及下一步勘探方向。黎凡特盆地主要发育有早期断层、中期断层和晚期断层等3期构造。早期断层主要受控于陆内断陷,盆地南部深水地区受后期挤压应力影响较小;中期断层主要受侧向构造应力和叙利亚弧型褶皱带影响,构造活动由北向南、由东向西逐渐减弱;受碰撞挤压和死海走滑断裂带影响,晚期断层十分发育,但基本未刺穿中新统上部厚层蒸发岩。结合已发现油气藏及露头情况,认为以色列远岸邻近埃拉托色尼隆起的深水地区中生界砂岩、碳酸盐岩及黎巴嫩深水地区新生界碳酸盐岩和塔马尔砂岩为下一步主要勘探方向。 展开更多
关键词 东地中海 岩相古地理 盆地构造 黎凡特盆地 深水沉积 油气勘探方向
下载PDF
Evaluation of Some Radioactive Materials and Heavy Metals in Marine Environment of Alexandria Coastline, Egypt
9
作者 E. R. Atta Kh. M. Zakaria 《Journal of Environmental Protection》 2014年第17期1618-1629,共12页
The present work is carried out to obtain quantitative information of some natural radioactive materials and heavy metals in water and sediment samples along the Alexandria Coastline, as a step to construct the baseli... The present work is carried out to obtain quantitative information of some natural radioactive materials and heavy metals in water and sediment samples along the Alexandria Coastline, as a step to construct the baseline map of the background radioactivity level in the Egyptian environment and also as a base data to assess the future physicochemical changes of surface coastal water and sediment in the studied area. The distribution of natural gamma emitting radionuclides such as 238U, 232Th and 40K has been established by gamma spectrometry. The results show that the area of Alexandria coast is affected by the existence of high back-ground radiation from the Rashid coast at the eastern side which has high levels of radioisotope concentrations due to black sand deposits which are dominant in this area. The absorbed dose rate (D, nGy&middot;h-1), annual effective dose equivalent, external hazard index (Hex) and representative level index (Ir) of the investigated radioactive materials were calculated. The concentration of Pb2+, Cd2+, Ni2+, Mn2+, Cu2+, Co2+, Zn2+ and Cr3+ ions has been determined using Atomic Absorption Spectroscopy. The total dissolved solids (TDS) in water samples ranged from 33,000 mg/l to 42,000 mg/l, the salinity ranged from 37.9% to 40.5% and pH ranged from 7.6 to 7.9. Some of the sediment quality guidelines are calculated and they are the metal pollution index (MPI), the contamination factor (CF), degree of contamination (Cdeg), and Pollution load index (PLI). 展开更多
关键词 mediterranean Sea water SEDIMENT RADIOACTIVE Materials Heavy Metals SEDIMENT Quality Guidelines
下载PDF
Quantifying relationships between rooting traits and water uptake under drought in Mediterranean barley and durum wheat 被引量:5
10
作者 Pedro Carvalho Sayed Azam-Ali M.John Foulkes 《Journal of Integrative Plant Biology》 SCIE CAS CSCD 2014年第5期455-469,共15页
In Mediterranean regions drought is the major factor limiting spring barley and durum wheat grain yields. This study aimed to compare spring barley and durum wheat root and shoot responses to drought and quantify rela... In Mediterranean regions drought is the major factor limiting spring barley and durum wheat grain yields. This study aimed to compare spring barley and durum wheat root and shoot responses to drought and quantify relationships between root traits and water uptake under terminal drought.One spring barley(Hordeum vulgare L. cv. Rum) and two durum wheat Mediterranean cultivars(Triticum turgidum L. var durum cvs Hourani and Karim) were examined in soil‐column experiments under well watered and drought conditions. Root system architecture traits, water uptake, and plant growth were measured. Barley aerial biomass and grain yields were higher than for durum wheat cultivars in well watered conditions. Drought decreased grain yield more for barley(47%) than durum wheat(30%, Hourani). Root‐to‐shoot dry matter ratio increased for durum wheat under drought but not for barley, and root weight increased for wheat in response todrought but decreased for barley. The critical root length density(RLD) and root volume density(RVD) for 90% available water capture for wheat were similar to(cv. Hourani) or lower than(cv. Karim) for barley depending on wheat cultivar. For both species, RVD accounted for a slightly higher proportion of phenotypic variation in water uptake under drought than RLD. 展开更多
关键词 BARLEY mediterranean root architecture root length density root traits root volume density water wheat
原文传递
Interaction between karstic aquifers and allogenic rivers: The aquifer of the national park of the ephemeral river Lobos Canyon (Spain)
11
作者 Eugenio Sanz Pérez Ignacio Menéndez Pidal Rafael Segovia Rosales 《Natural Science》 2013年第2期296-312,共17页
A methodology is described for understanding the interaction of karstic aquifers with allogenic rivers, where little information is available. This methodology includes conventional hydrogenology methods tracer tests ... A methodology is described for understanding the interaction of karstic aquifers with allogenic rivers, where little information is available. This methodology includes conventional hydrogenology methods tracer tests and measurements of flow into, out of and circulating within the karstic system. The method is designed to understand the hydrogeological behaviour of a river in sufficient detail, given a short study period. The methodology is applied to a karstic system in Spain, obtaining useful, quantitative results for a hydrological year, such as an estimate of the water balance, differentiation between autogenic and allogenic natural recharge, relationship and connection between the river and the aquifer, and measurements of infiltration capacity in watercourses under different hydrological situations. The paper deals with a useful example that could be applied to other rivers and aquifers where few data are available. It can be applied to aquifers under a natural regime and Mediterranean climate. 展开更多
关键词 River-Aquifer Relationship. water Balance Natural RECHARGE KARST HYDROLOGY mediterranean Climate
下载PDF
等积体在全球大洋中的空间分布及其古环境意义——国际大洋钻探计划对全球等深流沉积研究的贡献 被引量:3
12
作者 赵玉龙 刘志飞 《地球科学进展》 CAS CSCD 北大核心 2017年第12期1287-1296,共10页
等积体是海洋沉积最重要的类型之一,通常记录了长期的高分辨率古环境和古海洋演化信息,同时对海洋工程和油气开发等领域具有重要意义。通过对全球大洋进行钻探取芯和地球物理勘探,国际大洋钻探计划,尤其是最新阶段的"综合大洋钻探... 等积体是海洋沉积最重要的类型之一,通常记录了长期的高分辨率古环境和古海洋演化信息,同时对海洋工程和油气开发等领域具有重要意义。通过对全球大洋进行钻探取芯和地球物理勘探,国际大洋钻探计划,尤其是最新阶段的"综合大洋钻探计划(IODP)"和"国际大洋发现计划(IODP)",在理解等积体的全球分布特征及其揭示的古环境和古海洋演化信息方面做出了巨大的贡献。研究显示,等积体在全球大洋中的空间分布主要受大洋深层环流的影响,但在特定海区的沉积和分布则受到构造活动、深层海流强度和沉积物供应等多种因素的影响。全球深层海流强度的变迁则受到气候变化,如新生代全球变冷、北半球冰盖扩张、季风强度演变以及构造活动和水团来源等因素的影响,不同海区的主要影响因素也有所不同。 展开更多
关键词 等深流 等积体 国际大洋钻探计划(DSDP/ODP/IODP) 深层西部边界流(DWBC) 地中海溢出流(MOW)
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部