Marine bivalve bores above present high tide level in a limestone cliff near Ord, southern Skye

1985 ◽  
Vol 21 (2) ◽  
pp. 209-212
Author(s):  
J. D. Peacock
Keyword(s):  
High Tide ◽  
Marine Bivalve ◽  
Tide Level ◽  
Limestone Cliff

NODAL CYCLE, QUASI-LUNAR CYCLE, AND FLORIDA CURRENT INFLUENCES ON HIGH TIDE LEVEL IN MIAMI FLORIDA

2020 ◽  
Author(s):  
Martina Rogers ◽  
◽  
Michael C. Sukop ◽  
Jayantha Obeysekera ◽  
Florence George ◽  
...  
Keyword(s):  
High Tide ◽  
Lunar Cycle ◽  
Florida Current ◽  
Tide Level

scholarly journals Storm Surge Inundation Analysis with Consideration of Building Shape and Layout at Ise Bay by Maximum Potential Typhoon

2020 ◽  
Vol 8 (12) ◽  
pp. 1024
Author(s):  
Masaki Nimura ◽  
Shuzo Nishida ◽  
Koji Kawasaki ◽  
Tomokazu Murakami ◽  
Shinya Shimokawa
Keyword(s):  
Global Warming ◽  
High Resolution ◽  
Sea Level ◽  
Storm Surge ◽  
High Velocity ◽  
High Tide ◽  
Disaster Mitigation ◽  
Ise Bay ◽  
Building Shape ◽  
Tide Level

Global warming is feared to cause sea-level rise and intensification of typhoons, and these changes will lead to an increase in storm surge levels. For that reason, it is essential to predict the inundation areas for the maximum potential typhoon and evaluate the disaster mitigation effect of seawalls. In this study, we analyzed storm surge inundation of the inner part of Ise Bay (coast of Aichi and Mie Prefecture, Japan) due to the maximum potential typhoon in the future climate with global warming. In the analysis, a high-resolution topographical model was constructed considering buildings’ shape and arrangement and investigated the inundation process inside the seawall in detail. The results showed that buildings strongly influence the storm surge inundation process inside the seawall, and a high-velocity current is generated in some areas. It is also found that closing the seawall door delays the inundation inside the seawall, but the evacuation after inundation is more difficult under the seawall doors closed condition than opened condition when the high tide level exceeds the seawall.

Ecology and behaviour of immature Culicoides melleus (Coq.) (Dipt., Ceratopogonidae)

1972 ◽  
Vol 62 (1) ◽  
pp. 113-127 ◽  
Author(s):  
J. R. Linley ◽  
G. M. Adams
Keyword(s):  
Intertidal Zone ◽  
Laboratory Experiments ◽  
High Tide ◽  
Time Of Day ◽  
Fourth Instar ◽  
Tidal Level ◽  
Sand Surface ◽  
Tide Level ◽  
The Vertical Distribution ◽  
Incoming Tide

The distribution of the larvae and pupae of Culicoides melleus (Coq.) in a natural beach habitat in an inlet on the Florida coast was studied in relation to tidal level and time of day. Larvae and pupae were confined to the intertidal zone and these distributions were unaffected by time of day or tidal level. Distributions of younger larval instars were displaced towards the inferred area of oviposition at higher elevations on the beach. Pupae were associated with the zone at and somewhat below high tide level. Differences in the vertical distribution of larvae between 0 and 2 in. deep between dark (pre-dawn)/low tide, morning/low tide and afternoon/low tide conditions were probably associated with larval response to light and heat.In laboratory experiments with a temperature gradient, second- to fourth-instar larvae preferred the 18–25°C range, but the fourth instars were the least discriminating. Laboratory experiments with a simulated beach showed that pupae flooded on an incoming tide remained in their burrows and immediately buried themselves more deeply when waves were generated in the water; they were able to return to the surface if buried, and survived drowning for four days. Inundated areas were avoided as pupation sites. The orientation of pupae at the sand surface and their formation in burrows was related to negative phototactic responses of the pupating larvae.

scholarly journals Sediment Characterization and Monsoonal Impact on Beach Morphology at the Three Beaches along the Karachi Coast, Pakistan

2021 ◽  
Vol 12 (1) ◽  
pp. 8185
Author(s):  
Sumera Farooq ◽  
Nazia Arshad
Keyword(s):  
Monsoon Season ◽  
High Tide ◽  
Fine Sand ◽  
Coarse Sand ◽  
Sediment Characteristics ◽  
Sand Fraction ◽  
South West ◽  
South West Monsoon ◽  
Tide Level ◽  
West Monsoon

Sediment characteristics plays important role in the determination and functioning of coastal ecosystems. The present study is an attempt to evaluate the variability in sediment characteristics of the three beaches: Clifton, Sandspit and Buleji, at the Karachi coast. The samples were collected during pre-monsoon and south-west monsoon seasons to evaluate the seasonal differences. The sediments of the three sites showed variations in moisture content, organic matter and grain size. The highest mean moisture (27.17%) and organic contents (3.5 %) were recorded from the sediments of Clifton. The maximum fraction of sediments (> 80 %) consist of fine to very fine sand at all studied sites. The sediments of Clifton were high in very fine sand fraction and low in coarse sand fraction as compared to Sandspit and Buleji. The sediments of all the three studied sites are moderately sorted, negatively coarse-skewed and showed leptokurtic distribution. The studied beaches of Clifton, Sandspit and Buleji shows dissimilarity in sediment characteristics as indicated through Cluster and PCA analysis. The monsoonal influence on sediment characteristics was also observed at all the three studied beaches. The strong wave action during SW monsoon season results in the deposition of the coarser sediments at the high tide level thus increasing the steepness of the beaches.

Glacial geology of Grand Manan Island, New Brunswick

1980 ◽  
Vol 17 (4) ◽  
pp. 440-452 ◽  
Author(s):  
Robert F. Legget
Keyword(s):  
New Brunswick ◽  
High Tide ◽  
Rock Surface ◽  
Bay Of Fundy ◽  
Glacial Geology ◽  
Maritime Provinces ◽  
Carbon 14 ◽  
Last Glaciation ◽  
Tide Level ◽  
Abundant Evidence

Grand Manan is the largest of an archipelago of 20 islands at the mouth of the Bay of Fundy. Twenty-four kilometres long and 11 km wide, its western part consists of Triassic basalt with cliffs up to 120 m high. The eastern section consists of older rocks, is low lying, and is the site of the main settlements. Early scientific visitors thought that the island had escaped glaciation but there is abundant evidence to show that it did not, although the age of the last glaciation has not yet been established. Outwash and raised beach deposits are found throughout the island. Glacial striae show directions of ice movement ranging over 120°. Examples of multidirectional striae on the same rock surface have been observed. Isolated glacial erratics, some from the New Brunswick mainland, are found in the eastern part of the island, with one unusual assemblage on the south coast. A few exposures of till are described, one exhibiting two superposed tills of differing lithology, as known elsewhere in the Maritime Provinces. Carbon-14 dating of organic matter exposed at about half tide level and about 4 m above high tide level appears to agree with estimates of the changes of sea level during the last 16 000 years for other parts of the Maritime Provinces.

System Analysis and Numerical Simulation of Land Subsidence in Shanghai

2012 ◽  
Vol 241-244 ◽  
pp. 2578-2582
Author(s):  
Guo Dong Wang ◽  
Jian Cheng Kang ◽  
Guo Dong Yan ◽  
Qin Chen Han
Keyword(s):  
Land Subsidence ◽  
System Analysis ◽  
Slow Growth ◽  
Model Simulation ◽  
High Tide ◽  
Groundwater Extraction ◽  
Tide Level ◽  
Load Increase ◽  
Warning Response ◽  
Huangpu River

Land subsidence has become a major geological hazard in Shanghai . Based on the view of system theory, The paper sets a numerical model of land subsidence, the results of model simulation are as follows: 1) the speed of land subsidence will be 8.81mm/a in Shanghai in the next 10 years if it can maintain present trends of load increase and groundwater mining; 2) Since 1998, we adjust the ratio of groundwater extraction and filling to 1:1, the accumulated quantity of land subsidence will rebound to 30mm in 2017, from 2018, it will continue to drop. However, the overall future land subsidence will keep the trend of slow growth; 3) Double the exploitation capacity in1998, the speed of land subsidence will be 41mm/a in 2020, the accumulative quantity of land subsidence will be close to 1m. According to the average high tide level (5.15m) in the Huangpu River in 2000-2008, the actual average high tide level of the Huangpu River will reach about 6m and exceed the orange warning response against flood and typhoon in Shanghai. If superimposing sea level rise and strong typhoon disasters, it will face with more serious flood risk.

scholarly journals Studies on Ligia oceanica. I. A. Habitat and Effect of Change of Environment on Respiration. B. Observations on Moulting and Breeding

1931 ◽  
Vol 17 (3) ◽  
pp. 655-673 ◽  
Author(s):  
Aubrey G. Nicholls
Keyword(s):  
Fresh Water ◽  
High Tide ◽  
Gradual Transition ◽  
Tide Level

1. Ligia is a nocturnal animal inhabiting crevices in rocks above high-tide level. It is omnivorous though Fucus spp. form the main article of diet.2. Immersion experiments were carried out in which the animals were subjected to a gradual transition from salt to fresh water. None survived this treatment for more than one month. It was noticed that the reduction in salinity was accompanied by an increase in the rate of beat of the pleopods.3. Animals were subjected to sudden and gradual changes in temperature. One specimen survived a change from water at 15° C. to water at 30° C. for 28 minutes, but was dead after 78 minutes; a second, changed from water at 15° C. to water at 35° C, was to all appearances dead after 8 minutes, but recovered after being replaced in water at the original temperature.

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