1,178 research outputs found
Methods for field measurement and remote sensing of the swash zone
No full textSwash action is the dominant process responsible for the cross-shore exchange of sediment between the subaerial and subaqueous zones, with a significant part of the littoral drift also taking place as a result of swash motions. The swash zone is the area of the beach between the inner surfzone and backbeach that is intermittently submerged and exposed by the processes of wave uprush and backwash. Given the dominant role that swash plays in the morphological evolution of a beach, it is important to understand and quantify the main processes. The extent of swash (horizontally and vertically), current velocities and suspended sediment concentrations are all parameters of interest in the study of swash processes. In situ methods of measurements in this energetic zone were instrumental in developing early understanding of swash processes, however, the field has experienced a shift towards remote sensing methods. This article outlines the emergence of high precision technologies such as video imaging and LIDAR (light detection and ranging) for the study of swash processes. Furthermore, the applicability of these methods to large-scale datasets for quantitative analysis is demonstrated
Perceptions of rip current myths from the central south coast of England
No full textRip currents (rips) are the global leading cause of fatalities on surf beaches, yet numerous long-standing misconceptions exist. Evidence of the prevalence of these myths is largely anecdotal. This opportunistic, exploratory study presents perceptions on rip current hazards (n = 187), of members of the public attending an open day at the National Oceanography Centre, Southampton. The survey was undertaken as a fun but informative quiz, aimed at families attending the research-facility. It also explored using such events as a conduit to gain valuable knowledge on the understanding of rip currents and other hazards. While most respondents (81%) knew appropriate escape strategies (swim parallel and stay afloat), only 11% identified what makes rips dangerous (panic), with 44% incorrectly saying that rips suck you under. Rip identification is poor, and many are unaware of the meaning of beach safety flags. This study identifies that safety communication messaging needs to focus on debunking rip current myths, to improve understanding of safe swimming areas; and to reduce panic if caught in a rip
Cold Hardiness Data
No full textAuthor: Jaime Sebastian Azconaemail: [email protected]: Sebastián-Azcona J, Hamann A, Hacke U, Rweyongeza D (2018). Survival, growth and cold hardiness tradeoffs in white spruce populations: implications for assisted migration. Forest Ecology and ManagementFile descriptions: - "Sebastian-Azcona-2016-Cold-Hardiness-Data.csv" Raw data of cold hardiness measurements. - "Sebastian-Azcona-Climate-Provenances.csv" Provenance coordinates and climate data extracted from ClimateNA v5.21</div
4. Passion in the Work of Johann Sebastian Bach
No full textPassions are exceptionally important in the works of Johann Sebastian Bach. His passion compositions are based particularly on Luther’s reformation, chiefly on developmental tendency which is based on the works of Johann Walter, Hans Leo Hassler and Michael Praetorius. The most significant forerunner of J. S. Bach was Heinrich Schütz. J. S. Bach’s textual aspect is aimed at the model of passion oratorio the main representative of which was a librettist Heinrich Brockes who worked in Hamburg. The interesting fact is that before the arrival of J. S. Bach, in 1723, there was no long tradition of passions in Leipzig. They were performed there in 1721 for the first time. J. S. Bach is demonstrably the author of the two passions: St Matthew Passion BWV 244 and St John Passion BWV 245. The authorship of Johann Sebastian Bach in St. Lukas Passion BWV 246 is strongly called into question and from St Mark Passion BWV 24 only the text was preserved
Methodology for ion neutralization at solid/electrolyte interfaces
No full textPT: J; CR: ADELMAN SA, 1974, J CHEM PHYS, V61, P4242 ADELMAN SA, 1975, J CHEM PHYS, V62, P4908 ADELMAN SA, 1976, J CHEM PHYS, V64, P2375 ANDERSON PW, 1961, PHYS REV, V124, P41 BLANDIN A, 1976, J PHYSIQUE, V37, P369 BLOSS W, 1978, SURF SCI, V72, P277 BOCKRIS JOM, 1963, P ROY SOC LOND A MAT, V274, P55 BRAKO R, 1981, SURF SCI, V108, P253 BRAKO R, 1984, PHYS REV B, V30, P5629 BRAKO R, 1985, PHYS SCR, V32, P451 BRAKO R, 1985, SOLID STATE COMMUN, V55, P633 CHAMBERS LG, 1976, INTEGRAL EQUATIONS S, P114 CIZEK J, 1969, ADV CHEM PHYS, V14, P35 EASA SI, 1985, SURF SCI, V161, P129 GRIMLEY TB, 1983, SURF SCI, V124, P305 MAKOSHI K, 1984, J PHYS SOC JPN, V53, P2441 MCDOWELL HK, 1982, CHEM PHYS, V72, P451 MCDOWELL HK, 1982, J CHEM PHYS, V77, P3263 MCDOWELL HK, 1985, J CHEM PHYS, V83, P772 MORRISON SR, 1980, ELECTROCHEMISTRY SEM, P31 NEWNS DM, 1969, PHYS REV, V178, P1123 NEWNS DM, 1983, PHYS SCRIPTA, V6, P5 PARENT LG, 1984, J ELECTROANAL CH INF, V163, P23 SCHMICKLER W, 1979, J ELECTROANAL CHEM, V100, P533 SCHMICKLER W, 1980, J ELECTROANAL CH INF, V113, P159 SCHUGARD M, 1977, J CHEM PHYS, V66, P2534 SEBASTIAN KL, 1981, SURF SCI, V110, L571 SEBASTIAN KL, 1983, PHYS LETT A, V98, P39 SEBASTIAN KL, 1985, PHYS REV B, V31, P6976 SHANKAR R, 1982, PRINCIPLES QUANTUM M, P482 SROUBEK Z, 1981, SPRINGER SERIES CHEM, V17, P277 TULLY JC, 1980, ANNU REV PHYS CHEM, V31, P319 WATSON GN, 1966, TREATISE THEORY BESS YEAGER E, 1982, SURF SCI, V101, P1; NR: 34; TC: 18; J9: J ELECTROANAL CHEM; PG: 12; GA: C8849Source type: Electronic(1
Pulsations in surf zone currents on a high energy mesotidal beach in New Zealand
Get PDFThe exchange of material between the surf zone and continental shelf can be driven by pulsations in rip current velocities. However, there is a poor understanding of the relationship of these pulsations to surf zone morphology and material exchange. Moreover, understanding of rip current dynamics has focused mainly on single-barred beaches in an intermediate state, and there have been few studies on high energy beaches. Therefore, this paper undertakes preliminary research on surf zone current velocity pulsations, on a high energy beach in New Zealand. This initial analysis presents results from two days of measurements using Acoustic Doppler Velocimeters and Lagrangian GPS drifters. Drifters revealed pulsations in current velocities on the order of ?0.5–2 m s?1 throughout the surf zone, whether inside a rip current circulation cell or not. More infragravity wave energy was associated with constant pulsations in current velocity, and lower infragravity energy with pulsation bursts, lasting 5–10 minutes, interspersed with periods of relatively constant velocity lasting 15–25 minutes. However, higher wave conditions also reduced the exit rate from the surf zone
Rip current observations on a low-sloping dissipative beach
No full textRip currents are the main cause of beach rescues and fatalities. Key drivers of rip current hazard are: (1) fast current speeds; and (2) the exit rate of floating material from inside to outside of the surf zone. Exit rates may vary temporally, such as due to Very Low Frequency (VLF) motions, which have a period on the order of 10 minutes. However, there is little field data to determine the driver(s) of exit rate. Therefore, the aim of this research was to determine rip current circulation patterns, and specifically, determine their relationship to surf zone exits, on a high-energy dissipative beach. Three days of field measurements were undertaken at Ngarunui Beach, New Zealand. Three daily surf zone flow patterns were found: (1) alongshore; (2) surf zone eddy with high exit rate; and (3) surf zone eddy with no exits. There were strong infragravity peaks in energy within the surf zone, at 30-45s, although none at VLF (~10 minute) frequencies. Further research is underway to determine what drove the high surf zone exit rate observed at Ngarunui Beach
Does the Current Account Matter?
Get PDFThe purpose of this paper is to investigate in detail the behavior of the current account in emerging economies, and in particular its role if any in financial crises. Models of current account behavior are reviewed, and a dynamic model of current account sustainability is developed. The empirical analysis is based on a massive data set that covers over 120 countries during more than 25 years. Important controversies related to the current account including the extent to which current account deficits help predict currency crises are also analyzed. Throughout the paper I am interested in analyzing whether there is evidence supporting the idea that there are costs involved in running 'very large' deficits. Moreover, I investigate the nature of these potential costs, including whether they are particularly high in the presence of other type of imbalances.
Many-electron treatment of quasi-resonant ion neutralization at solid surfaces
No full textPT: J; CR: AMOS AT, IN PRESS ADV CHEM AMOS AT, 1986, PHYS LETT A, V118, P471 BATTAGLIA F, 1985, J CHEMM PHYS, V83, P3847 BATTAGLIA F, 1985, SURF SCI, V161, P163 DAVISON SG, 1986, J ELECTROANAL CH INF, V204, P173 EASA SI, 1985, SURF SCI, V161, P129 ERICKSON RL, 1975, PHYS REV LETT, V34, P297 GRIMLEY TB, 1983, SURF SCI, V124, P305 ROSEN N, 1932, PHYS REV, V40, P502 RUSH TW, 1977, INELASTIC ION SURFAC, P73 SEBASTIAN KL, 1983, PHYS LETT A, V98, P39 SEBASTIAN KL, 1985, PHYS REV B, V31, P6976 SULSTON KW, 1921, PHYS REV B, V37, P91 SULSTON KW, 1988, SURF SCI, V197, P555; NR: 14; TC: 3; J9: SOLID STATE COMMUN; PG: 4; GA: AJ742Source type: Electronic(1
Role of surface states in ion scattering
No full textPT: J; CR: AMOS AT, 1986, PHYS LETT A, V118, P471 DAVISON SG, 1986, J ELECTROANAL CH INF, V204, P173 ERICKSON RL, 1975, PHYS REV LETT, V34, P297 MCDOWELL HK, 1982, J CHEM PHYS, V77, P3263 RUSCH TW, 1977, INELASTIC ION SURFAC, P73 SEBASTIAN KL, 1985, PHYS REV B, V31, P6976 SULSTON KW, 1984, SURF SCI, V148, P311; NR: 7; TC: 12; J9: SOLID STATE COMMUN; PG: 3; GA: H6713Source type: Electronic(1
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