Port Infrastructure Control (Madeira Island,Portugal) through a Hybrid Monitoring System (GNSS and Accelerometers)     

Mário Pereira  Fernando Veloso-Gomes  José Lima  Sérgio Oliveira 《Marine Georesources & Geotechnology》2016,34(7):617-629

This article describes the implementation of a monitoring system on the breakwater at the Funchal Port (Madeira Island, Portugal) for the purpose of understanding its dynamic behavior and the temporal evolution of structural health. The monitoring system focuses on the breakwater superstructure and aims to identify the evolution of damage on the breakwater and analyze the impact of cruise ships docking and undocking. The system includes the measurement of displacements through geodetic techniques using global navigation satellite systems and the measurement of vibrations using accelerometers. Ten observation campaigns were performed over almost 3 years. As the measured displacements during this period were less than 7.5 mm it can be concluded that, despite some visible cracks, the breakwater superstructure did not suffer significant structural changes. It was shown from the measured acceleration records that some of the main modal parameters could be identified, namely the main natural frequencies of the superstructure. Through an analysis of the natural frequencies progression over time, it will be possible to identify deterioration effects on the foundation and/or the superstructure. The comparison of natural frequencies identified could be useful to evaluate the impact of these events on structural health.  相似文献   

Remediation of PCE contaminated clay soil by coupling electrokinetics with zero-valent iron permeable reactive barrier     

Daryoush Yousefi Kebria  Maryam Taghizadeh  José Villaseñor Camacho  Nima Latifi 《Environmental Earth Sciences》2016,75(8):699

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Further evidence for magnetic susceptibility as a proxy for the evaluation of heavy metals in mining wastes: case study of Tlalpujahua and El Oro Mining Districts     

Juan Morales  María del Sol Hernández-Bernal  Pedro Corona-Chávez  Avto Gogichaishvili  Francisco Bautista 《Environmental Earth Sciences》2016,75(4):309

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Quality indices of groundwater for agricultural use in the region of Tierra Nueva,San Luis Potosi,Mexico     

José Alfredo Ramos-Leal  B. López-Álvarez  G. Santacruz-De León  O. Almanza-Tovar  J. Morán-Ramírez  D. A. Padilla-Reyes  Z. I. González-Acevedo 《Arabian Journal of Geosciences》2016,9(19):736

The paper evaluates the quality of groundwater for agricultural use in Tierra Nueva, San Luis Potosi, Mexico, where the agricultural productivity zone presents problems of salinity soil. Twenty groundwater samples and 11 soil samples at 2 depths at each point were collected and analyzed. In this type of water quality study, Wilcox classification diagram and the method of Salinity Laboratory United States for the quality of agricultural land were used. However, in some cases, these rankings do not reflect the actual condition, as in the case of Tierra Nueva, where the soil is classified as normal while water is classified at intermediate good. To analyze the real conditions of soil and water quality indicators of water for agricultural use risk of salinization, sodium adsorption ratio, adsorption ratio magnesium, permeability index, sodium percentage, soluble sodium percentage, residual sodium carbonate, and Kelly ratio were used. Sodicity rates including sodium adsorption ratio indicate no problem in soil extract. However, 25% of water samples are dangerous, with levels ranging from medium to high. For indexes of sodium percentage, residual sodium carbonate, and Kelly ratio, a distribution of classes ranging from questionable to inadequate was applied. Salinity levels show that effective salinity has good classification; potential salinity (PS) is conditional and therefore not recommended; and osmotic potential and electrical conductivity are classified as high in saline water, which is an increasingly important problem. The combination of different indices emphasized serious problems of salinity conditions, particularly sodicity.  相似文献   

Air Quality Index Revisited from a Compositional Point of View   总被引：1，自引：0，他引：1  

Eusebi Jarauta-Bragulat  Carme Hervada-Sala  Juan José Egozcue 《Mathematical Geosciences》2016,48(5):581-593

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An ecological classification of rocky shores at a regional scale: a predictive tool for management of conservation values          下载免费PDF全文

Elvira Ramos  Araceli Puente  José A. Juanes 《Marine Ecology》2016,37(2):311-328

The ecological classification of coastal waters has become an important issue in ecosystem water quality assessment. Previous studies have suggested that abiotic variables seem to be a suitable alternative to biological data for classifying coastal areas at different scales. The study presented here proposes a downscaling methodology for the classification of coastal waters at a regional scale within the NE Atlantic based on standardized data and objective decision rules. Physical variables (temperature, wave exposure, tidal range and radiation) were selected because of their ecological role, availability and statistical decision rules. This information was based on satellite data and mathematical modelling of natural coastal processes. The N and NW Spanish coastline was subdivided into 41 20‐km segments that were classified according to physical variables using the self‐organizing map and k‐means algorithms. To validate the classification with biological data, 21 sites representing the entire range of physical typologies in the study area were simultaneously and consistently sampled. Intertidal macroalgae were identified in each of 10 quadrats of 50 × 50 cm for two to three transects per site, according to a stratified sampling procedure. The coverage of macroalgae was obtained by photographic analysis. The physical classification shows four typologies: Lower Rias, Upper Rias, West Cantabric and East Cantabric. Statistical analyses confirmed the ecological significance of these typologies at the tidal levels where seaweeds were the major structural element (lower and middle intertidal). According to the biological data, the greatest differences were found between the Upper Rias and the rest of the N and NW Iberian Peninsula coast. Thus, the classification methodology has potential application as a management tool.  相似文献   

Extension and inversion structures in the Tethys–Atlantic linkage zone,Algarve Basin,Portugal     

Adrià Ramos  Oscar Fernández  Pedro Terrinha  Josep Anton Muñoz 《International Journal of Earth Sciences》2016,105(5):1663-1679

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Geophysical characterization of buried active faults: the Concud Fault (Iberian Chain,NE Spain)   总被引：2，自引：0，他引：2  

Óscar Pueyo Anchuela  Paloma Lafuente  Luis Arlegui  Carlos L. Liesa  José L. Simón 《International Journal of Earth Sciences》2016,105(8):2221-2239

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Wrack Removal as Short-Term Disturbance for <Emphasis Type="Italic">Talitrus Saltator</Emphasis> Density in the Supratidal Zone of Sandy Beaches: an Experimental Approach     

Mª Carmen Ruiz-Delgado  Jenyffer Vierheller Vieira  Mª José Reyes-Martínez  Carlos Alberto Borzone  Juan Emilio Sánchez-Moyano  Francisco José García-García 《Estuaries and Coasts》2016,39(4):1113-1121

A distinctive feature of sandy beaches is the stranded wrack, which represents a key element in the maintenance of their biodiversity and ecosystem function. However, these materials are commonly removed from beaches worldwide. In October–November 2012, a field experiment following an M-BACI design was conducted to assess the effect of wrack removal on sandhopper populations on two sandy beaches on the Atlantic southwest coast of Spain. The beaches, Levante (36°33′N, 6°13′W) and Cortadura (36°28′N, 6°15′W) differed in their morphodynamics (dissipative and intermediate, respectively) and in the dominant wrack sources (seagrasses vs. macroalgae). Wrack removal diminished the density of the sandhopper, Talitrus saltator, a dominant species in the supratidal zone especially under wrack, but the difference between impacted and control plots was short-lived (several days). Juvenile sandhoppers appeared more sensitive to this disturbance than adults, although this was found only at Levante. This study highlights the adaptability of this sandhopper to a single wrack removal event and shows that the magnitude of the effect is likely dependent on the particular characteristics of individual beaches. The consequences of frequent wrack removal from these beaches on sandhopper populations remain to be determined.  相似文献   

Relevance of cod (Gadus morhua L.) predation for inter-cohort variability in mortality of juvenile Norwegian spring-spawning herring (Clupea harengus L.)     

de Barros  Pedro; Tirasin  E. Mumtaz; Toresen  Reidar 《ICES Journal of Marine Science》1998,55(3):454-466

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