Numerical study of diurnal tidal currents on the Pacific shelf off the southern coast of Hokkaido, Japan

2021 ◽  
Vol 230 ◽  
pp. 104568
Author(s):  
Hiroshi Kuroda ◽  
Takahiro Tanaka ◽  
Sayaka Ito ◽  
Takashi Setou
Keyword(s):  
Numerical Study ◽  
Tidal Currents ◽  
Southern Coast ◽  
The Pacific

scholarly journals A Numerical Study of the Analytical Downward Continuation Error in Geoid Computation by EGM08

2011 ◽  
Vol 1 (1) ◽  
pp. 2-8 ◽  
Author(s):  
L. Sjöberg ◽  
M. Bagherbandi
Keyword(s):  
Numerical Study ◽  
Analytical Continuation ◽  
Downward Continuation ◽  
The Pacific ◽  
Topographic Bias ◽  
Significant Difference ◽  
Topographic Potential ◽  
Zero Degree ◽  
High Degree ◽  
Geoid Computation

A Numerical Study of the Analytical Downward Continuation Error in Geoid Computation by EGM08Today the geoid can be conveniently determined by a set of high-degree spherical harmonics, such as EGM08 with a resolution of about 5'. However, such a series will be biased when applied to the continental geoid inside the topographic masses. This error we call the analytical downward continuation (DWC) error, which is closely related with the so-called topographic potential bias. However, while the former error is the result of both analytical continuation of the potential inside the topographic masses and truncation of a series, the latter is only the effect of analytical continuation.This study compares the two errors for EGM08, complete to degree 2160. The result shows that the topographic bias ranges from 0 at sea level to 5.15 m in the Himalayas region, while the DWC error ranges from -0.08 m in the Pacific to 5.30 m in the Himalayas. The zero-degree effects of the two are the same (5.3 cm), while the rms of the first degree errors are both 0.3 cm. For higher degrees the power of the topographic bias is slightly larger than that for the DWC error, and the corresponding global rms values reaches 25.6 and 25.3 cm, respectively, at nmax=2160. The largest difference (20.5 cm) was found in the Himalayas. In most cases the DWC error agrees fairly well with the topographic bias, but there is a significant difference in high mountains. The global rms difference of the two errors clearly indicates that the two series diverge, a problem most likely related with the DWC error.

The Cumacean Dimorphostylis elegans Gamô, 1960 (Crustacea), D. bathyelegans n. sp. and D. brevicarpus n. sp. from Japan

Zootaxa ◽  
2011 ◽  
Vol 2994 (1) ◽  
pp. 45 ◽  
Author(s):  
TADASHI AKIYAMA
Keyword(s):  
East China Sea ◽  
Ventral Surface ◽  
East China ◽  
Southern Coast ◽  
The East China Sea ◽  
China Sea ◽  
The Third ◽  
The Pacific ◽  
Nansei Islands ◽  
Honshu Island

Dimorphostylis elegans Gamô, 1960 and two related new species, D. bathyelegans n. sp. and D. brevicarpus n. sp. are described. Dimorphostylis elegans were collected from the Pacific coasts of Honshu and Shikoku Islands, and the East China Sea, Japan, 74–443 m. As a result, D. latifrons Harada, 1960 from the Izu Peninsula, Japan is declared a junior synonym of D. elegans. Morphological variation of the carapace is discussed. Dimorphostylis bathyelegans, from southern coast of the Honshu Island and the East China Sea, is very similar to D. elegans, but is distinguished from the latter by the long telson and the third peduncle article of antenna 1 with more short setae. Depth of the habitat ranges from 495–918 m, which is the deepest known species in the genus. Dimorphostylis brevicarpus was collected from Kyushu and Nansei Islands, East China Sea, on sandy bottoms, 165–236 m deep. This species also resembles D. elegans, but is distinguished from the latter by (1) short carpus of pereopods 3–5, (2) anterior end of dorsolateral carina with 2 or 3 teeth, and (3) maxilliped 1 with a group of sharp spines on the ventral surface of basis, and (4) carapace covered with numerous small pits, with a tiny seta in each.

scholarly journals FORECASTING THE WAVE-CURRENT INTERACTIONS AT THE MOUTH OF THE COLUMBIA RIVER, OR, USA

2012 ◽  
Vol 1 (33) ◽  
pp. 53 ◽  
Author(s):  
Sarah Kassem ◽  
H. Tuba Ozkan-Haller
Keyword(s):  
Pacific Northwest ◽  
Mean Squared Error ◽  
River Mouth ◽  
Columbia River ◽  
Tidal Currents ◽  
General Effect ◽  
The Pacific ◽  
Wave Forecast ◽  
Channel Wave ◽  
Wave Heights

An operational wave forecast of the area near the mouth of the Columbia River is presented. This region is known for its large waves and strong tidal currents. The forecast is forced with full directional spectra obtained from a refined WaveWatchIII forecast of the Pacific Northwest, and tidal current inputs are obtained from an estuarine circulation forecast of the Columbia River. The forecast has been operational since August 2011 providing short-term predictive wave information at the mouth of the Columbia River. Results from a 6-month period are promising, with a normalized root-mean-squared error (NRMSE) of 16% at the location of an inshore buoy, which is located outside the zone of tidal influence in 25 m water depth. Near the river mouth and in the channel, wave heights are heavily dominated by the tidal currents which significantly increase wave heights on ebb tides. Hindcast results shows that the model is able to predict the general effect of the tidal currents with a NRMSE of 30% in wave heights at the river mouth. Despite some of the model limitations, it still provides valuable information to navigators and bar pilots since it includes the effects of the tidal currents.

A numerical study of the Kuroshio-induced circulation in Tosa Bay, off the southern coast of Japan

2013 ◽  
Vol 53 ◽  
pp. 50-62 ◽  
Author(s):  
Hiroshi Kuroda ◽  
Takashi Setou ◽  
Kazuhiro Aoki ◽  
Daisuke Takahashi ◽  
Manabu Shimizu ◽  
...  
Keyword(s):  
Numerical Study ◽  
Southern Coast ◽  
Tosa Bay ◽  
The Kuroshio

Effects of tidal currents on winter wind waves in the Qiongzhou Strait: a numerical study

2020 ◽  
Vol 39 (11) ◽  
pp. 33-43
Author(s):  
Peng Bai ◽  
Zheng Ling ◽  
Cong Liu ◽  
Junshan Wu ◽  
Lingling Xie
Keyword(s):  
Numerical Study ◽  
Wind Waves ◽  
Tidal Currents ◽  
Qiongzhou Strait
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