Fernando Dalmasso di Garzegna     

Mario Bossolasco 《Pure and Applied Geophysics》1941,3(1):21-22

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Sul trasporto eolico delle sabbie e ceneri vulcaniche     

Dott. Ing. Mario Catella 《Pure and Applied Geophysics》1940,2(1):159-164

Riassunto Premessi i dati di osservazione sulle sabbie e sulle ceneri proiettate dall'Etna nella fase esplosiva del 16-III-1940 e trasportate dai venti fino in Calabria, si espongono le caratteristiche fisiche dei materiali caduti e particolarmente quelle granulometriche in rapporto alla distanza di trasporto, confrontandole con le ceneri cadute nell'isola di Stromboli in occasione delle esplosioni di questo vulcano del 14-XII-1937 e del 22-V-1938.

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Summary After some remarks on the sands and the ashes projected by the Etna in the explosive period of March the 16^th, 1940, and carried by the wind as far as Calabria, the physical characters of the material fallen and particulary the granulometrical ones are exposed in relation to the distance of carriage, making some comparisons with the ashes fallen on the Isle of Stromboli in the occasion of the explosions of this volcano in Dec. the 14^th, 1937, and in May, the 22^th, 1938.

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Zusammenfassung Der Sand und die Aschen geworfen durch die Explosion der Etna am 16. 3. 1940 und die bis Kalabrien durch den Wind transportiert wurden, sind vom Verf. physikalisch untersucht worden und zwar besonders nach der Verteilung der Korngrösse im Verhältnis mit den Transport-Distanzen. Die Mitteilung der Ergebnisse geschieht mit Vergleichung derjenigen die sich auf die Aschen vom Stromboli beziehen, welche von diesem Vulkan am 1937 und 1938 geworfen worden sind.

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Genesi e sviluppo del Monsone di SW sull'Oceano Indiano     

Mario Bossolasco 《Pure and Applied Geophysics》1939,1(1):35-43

Riassunto Si espone e si discute il processo di formazione e di sviluppo del monsone di SW sull'Oceano Indiano, studiandone il comportamento iniziale a Ceylon (Colombo e Little Basses), Mogadiscio e Seychelles. Si illustra il fenomeno, dell' « irruzione » del monsone e si deduce come normalmente le formazioni bariche predominanti in maggio sul Golfo di Bengala, sull'India o sul Golfo Arabico, ostacolino e ritardino il propagarsi del monsone.  相似文献   

Survey abundance indices in a tropical estuarine lagoon and their management implications: a spatially-explicit approach   总被引：2，自引：1，他引：2  

Rueda  Mario; Defeo  Omar 《ICES Journal of Marine Science》2001,58(6):1219-1231

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Physiography and deposition on a distal deep-sea system: The Valencia Fan (Northwestern Mediterranean)     

Andrés Maldonado  Alberto Palanques  Belén Alonso  Kim A. Kastens  C. Hans Nelson  Suzanne O'Connell  William B. F. Ryan 《Geo-Marine Letters》1985,5(3):157-164

The Valencia Fan developed as the distal fill of a deep-sea valley, detached from the continental slope and the main sedimentary source. A survey of side-scan sonar, Sea Beam and reflection seismics shows that the sediment is largely fed through the Valencia Valley. The upper fan comprises large channels with low-relief levees, and the middle fan has sinuous distributary channels. Depositional bedforms predominate on the valley floor and levees, and erosional bedforms are common in the valley walls. A change to slope on the fan apex and the presence of volcanoes on the upper fan are the main factors influencing fan-growth pattern.  相似文献   

Evaluation of tectonic structure of İskenderun Basin (Turkey) using steerable filters     

A. Muhittin Albora  Nurdan Sayın  Osman N. Uçan 《Marine Geophysical Researches》2006,27(4):225-239

In this paper, we demonstrate the effectiveness of steerable filters as a method of delineating the boundaries of subsurface geological structures. Steerable filters, generally used for edge detection on 2-D images, have the properties of band pass filters with certain directions and are applied to many image processing problems. We first tested the method on synthetic data and then applied it to the aeromagnetic data of İskenderun Basin and adjacent areas.İskenderun Basin is located in the Northeastern Mediterranean where African–Arabian and Anatolian plates are actively interacting. The basin fill records a complex tectonic evolution since the Early Miocene, involving ophiolite emplacement, diachronous collision of Eurasian and Arabian plates and subsequent tectonic escape related structures and associated basin formation. Geophysical investigations of the tectonic framework of İskenderun Basin of Turkey provide important insights on the regional tectonics of the Eastern Mediterranean and Middle East. In this study we show geological structures, which are responsible for the magnetic anomalies in İskenderun Basin and enlighten the structural setting of the Northeastern Mediterranean triple junction using steerable filters. We obtained a magnetic anomaly map of the region from the General Directorate of Mineral Research and Exploration as raw data and then evaluated this by steerable filters. We determined the magnetic anomaly boundaries for İskenderun Basin by using various types of steerable filters and correlated these to drilling data and seismic profiles from the Turkish Petroleum Corporation. The result of the steerable filter analysis was a clarified aeromagnetic anomaly map of İskenderun Basin. The tectonic structure of İskenderun Basin is divided into regions by an N–S trending oblique-slip fault defined by the steerable filter outputs. We propose a new tectonic structure model of İskenderun Basin and modify the direction of the East Anatolian Fault Zone. In our model, East Anatolian Fault Zone cross-cuts the basin as a narrow fault zone and continues towards the Cyprus arc.  相似文献   

Effects of mining wastes on a seagrass ecosystem: metal accumulation and bioavailability, seagrass dynamics and associated community structure   总被引：1，自引：0，他引：1  

Marín-Guirao L  Atucha AM  Barba JL  López EM  Fernández AJ 《Marine environmental research》2005,60(3):317-337

Two different Cymodocea nodosa (Ucria) Ascherson beds growing in mining-contaminated sediments were compared with two reference beds in the Mar Menor coastal lagoon. The accumulation of Zn, Pb and Cd in different fractions of the plant, the sediment parameters that regulate the availability of metals, the seabed structure and dynamics of each seagrass bed and its associated macroinvertebrate community were studied. C. nodosa accumulates metals from the sediments and reflects their bioavailability for this seagrass. At each station, the metal content of the rhizomes was lower than that of leaves and roots. The concentration of acid-volatile sulfides does not seem to influence the availability of metals to the seagrass, possibly due to oxygen transport to underground tissues. The highest metal concentration in all the contaminated stations was found in the leaf-biofilm, due to the formation of complexes between metals and the extracellular polymeric substances that form the biofilm. All the seagrass beds were seen to be undergoing expansion, those growing in contaminated sediments accumulating great quantities of metals and showing highest photosynthetic leaf surface area and highest leaf biomass. However, these structural parameters were not seen to be responsible for the differences in the faunal composition observed between contaminated and reference beds. Moreover, the multivariate analysis identified the metal content of leaves, biofilm and sediments as important variables that may be responsible for these differences in faunal composition. In this study we have demonstrated that both the seagrass C. nodosa and the biofilm on the plant leaves may be used as environmental tools in the Mar Menor lagoon. The former is an useful indicator of sediment contamination, whereas the latter seems to be a good sentinel of water quality.  相似文献   

Characteristics of coastal erosion geometry under regular and irregular waves   总被引：1，自引：0，他引：1  

K Günayd?n  M.S Kabda?l? 《Ocean Engineering》2003,30(13):1579-1593

An experimental investigation of coastal erosion generated by the action of regular and irregular waves was carried out in laboratory channels. Natural beach sand, with medium diameter of 0.35 mm and specific gravity of 2.63, was used in this study. A 1:5 initial beach slope was selected for the model tests. Different wave groups were generated over the initially flat beach, and the characteristics of coastal erosion geometry such as erosion lengths, erosion depths, location of maximum erosion point, and total erosion areas were measured. The most important parameters governing coastal erosion were evaluated by using earlier investigations and experimental results. These parameters were expressed as a dimensionless group by using π theory. The empirical relationships between the geometric characteristics of coastal erosion and the dimensionless group are proposed through regression analysis for pure regular waves, pure irregular waves, and regular-irregular waves. The parameters, which were used to define geometric characteristics of coastal erosion, were evaluated and some ratios of these parameters gave a constant value.  相似文献   

Gravity analysis offshore the Canary Islands from a systematic survey     

A. Carbó  A. Muñoz-Martín  P. Llanes  J. Álvarez 《Marine Geophysical Researches》2003,24(1-2):113-127

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Indication of thiols in black sea deep water     

David Dyrssen  Conny Haraldsson  Stig Westerlund  Kerstin rn 《Marine Chemistry》1985,17(4):323-327

Potentiometric titrations of deep Black Sea water give reasonably precise values of sulphide in the concentration range 30–300 μmol l⁻¹ and a strong indication of thiols in the concentration range 10–30 μmol l⁻¹. Organic analysis of Black Sea water should therefore include the search for compounds containing SH groups. A simple stoichiometric model indicates that sulphur-containing proteins might be the main source of thiols after hydrolysis and deamination. The alkalinity and total sulphide are simply related by A_t = 3287 ± 30 + (3.84 ± 0.10) [H₂ S]_t μmol kg⁻¹. The slope of 3.84 instead of the stoichiometric slope of 2.31 indicates a lack of reduced sulphate in the form of hydrogen sulphide.  相似文献