نتایج جستجو برای: tide

تعداد نتایج: 6712  

2012
Hubert Chanson Richard Brown Mark Trevethan

In natural waterways and estuaries, the understanding of turbulent mixing is critical to the knowledge of sediment transport, stormwater runoff during flood events, and release of nutrient-rich wastewater into ecosystems. In the present study, some field measurements were conducted in a small subtropical estuary with micro-tidal range and semi-diurnal tides during king tide conditions: i.e., th...

ژورنال: علمی شیلات ایران 2012

Bahmanshir River with 80km length is located in the southwestern Khuzestan Province, Iran. The seasonal distribution of phytoplankton community in spring and summer of 2007 was investigated. The river presented different characteristics between the periods of high & low water (tidal). Within tidal period, diatoms were dominated followed by Cyanophyceae and Chlorophyceae. As a result, abundance ...

2017
B. D. Hamlington P. Thompson W. C. Hammond G. Blewitt R. D. Ray

Near-global and continuous measurements from satellite altimetry have provided accurate estimates of global mean sea level in the past two decades. Extending these estimates further into the past is a challenge using the historical tide gauge records. Not only is sampling nonuniform in both space and time, but tide gauges are also affected by vertical land motion (VLM) that creates a relative s...

Journal: :Philosophical transactions. Series A, Mathematical, physical, and engineering sciences 2006
F N Teferle R M Bingley S D P Williams T F Baker A H Dodson

Researchers investigating climate change have used historical tide-gauge measurements from all over the world to investigate the changes in sea-level that have occurred over the last century or so. However, such estimates are a combination of any true sea-level variations and any vertical movements of the land at the specific tide-gauge. For a tide- gauge record to be used to determine the clim...

2014
L. P. Almeida G. Masselink P. E. Russell M. A. Davidson

A 2D laser-scanner was deployed at the high tide runup limit of a pure gravel beach (Loe Bar, Cornwall, England) to measure high-frequency (2.5 Hz) swash hydrodynamics and topographic changes during an energetic wave event. Measurements performed with the laser-scanner were corrected to compensate for levelling and orientation errors, and a variance threshold was applied to separate the beach t...

Journal: :Harmful algae 2012
Emily R Hall Kate Nierenberg Anamari J Boyes Cynthia A Heil Leanne J Flewelling Barbara Kirkpatrick

Over the years, numerous outreach strategies by the science community, such as FAQ cards and website information, have been used to explain blooms of the toxic dinoflagellate, Karenia brevis that occur annually off the west coast of Florida to the impacted communities. Many state and federal agencies have turned to funded research groups for assistance in the development and testing of environm...

Journal: :Environmental monitoring and assessment 2014
K R Lallu K H Fausia J Vinita K K Balachandran K R Naveen Kumar T V Rehitha

Intra-tidal variability in the transport of materials through the Cochin estuary was studied over successive spring and neap tides to estimate the export fluxes of nutrients and chlorophyll a into the adjoining coastal zone. The results showed that there was a substantial increase in the freshwater flow into the estuary following heavy rains (~126 mm) prior to the spring tide observations. The ...

2008
Li-Ching Lin Hsien-Kuo Chang

The paper presents an adaptive neuro fuzzy inference system for predicting sea level considering tide-generating forces and oceanic thermal expansion assuming a model of sea level dependence on sea surface temperature. The proposed model named TGFT-FN (tide-Generating Forces considering sea surface temperature and Fuzzy neuro-network system) is applied to predict tides at five tide gauge sites ...

2016
B. D. Hamlington P. R. Thompson

Recent efforts in reconstructing historical sea level change have led to a range of published estimates for the global mean sea level trend over the last century. Disagreement in these estimates can be attributed to two factors: (1) differences in analysis and/or reconstruction techniques and (2) differences in tide gauge selection and quality control of the data. Here the impact of tide gauge ...

Farzaneh, Saeed, Parvazi, Kamal, Namazi, Bahare , Sharifi, Mohammad Ali ,

Although tidal observations which are extracted from coastal tide gages, have higher accuracy due to their higher sampling rate, installing these types of gages can impose some spatial limitation since we cannot use every part of sea to install them. To solve this limitation, we can employ satellite altimetry observations. However, satellite altimetry observations have lower sampling rate. Acco...

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