scholarly journals Littoral Current and Sand Drift around the Delta Type Reef Suitable for Surf-riding

1993 ◽  
Vol 9 ◽  
pp. 229-234
Author(s):  
S. Nakano ◽  
Y. Yoshida ◽  
K. Nakano ◽  
H. Mitsui
Keyword(s):  
Sand Drift ◽  
Delta Type ◽  
Littoral Current ◽  
Surf Riding

scholarly journals Wave Properties around Delta-Type Reef and Crescent-Type Submerged Mound for Enjoying Surf-riding

1997 ◽  
Vol 13 ◽  
pp. 19-24
Author(s):  
Susumu Nakano ◽  
Yasufumi Takata ◽  
Toyoaki Mishima ◽  
Hiroshi Mitsui
Keyword(s):  
Delta Type ◽  
Surf Riding ◽  
Wave Properties

scholarly journals Wave Control for Surf-riding with Crescent-type Submerged Mound and Delta-type Reef

1995 ◽  
Vol 11 ◽  
pp. 43-48
Author(s):  
Susumu Nakano ◽  
Hiroshi Mitsui ◽  
Toyoaki Mishima
Keyword(s):  
Delta Type ◽  
Surf Riding ◽  
Wave Control

Lake and inland dunes as interconnected Systems: The story of Lake Tresssee and an adjacent dune field (Schleswig-Holstein, North Germany)

The Holocene ◽  
2020 ◽  
pp. 095968362098168
Author(s):  
Christian Stolz ◽  
Magdalena Suchora ◽  
Irena A Pidek ◽  
Alexander Fülling
Keyword(s):  
Water Level ◽  
Bronze Age ◽  
Environmental Changes ◽  
High Water ◽  
Alluvial Fan ◽  
Water Levels ◽  
Lake Area ◽  
Dune Field ◽  
The North ◽  
Sand Drift

The specific aim of the study was to investigate how four adjacent geomorphological systems – a lake, a dune field, a small alluvial fan and a slope system – responded to the same impacts. Lake Tresssee is a shallow lake in the North of Germany (Schleswig-Holstein). During the Holocene, the lake’s water surface declined drastically, predominately as a consequence of human impact. The adjacent inland dune field shows several traces of former sand drift events. Using 30 new radiocarbon ages and the results of 16 OSL samples, this study aims to create a new timeline tracing the interaction between lake and dunes, as well, as how both the lake and the dunes reacted to environmental changes. The water level of the lake is presumed to have peaked during the period before the Younger Dryas (YD; start at 10.73 ka BC). After the Boreal period (OSL age 8050 ± 690 BC) the level must have undergone fluctuations triggered by climatic events and the first human influences. The last demonstrable high water level was during the Late Bronze Age (1003–844 cal. BC). The first to the 9th century AD saw slightly shrinking water levels, and more significant ones thereafter. In the 19th century, the lake area was artificially reduced to a minimum by the human population. In the dunes, a total of seven different phases of sand drift were demonstrated for the last 13,000 years. It is one of the most precisely dated inland-dune chronologies of Central Europe. The small alluvial fan took shape mainly between the 13th and 17th centuries AD. After 1700 cal. BC (Middle Bronze Age), and again during the sixth and seventh centuries AD, we find enhanced slope activity with the formation of Holocene colluvia.

Dynamic Instability in Quartering Seas—Part II: Analysis of Ship Roll and Capsize for Broaching

1996 ◽  
Vol 40 (04) ◽  
pp. 326-336
Author(s):  
K. J. Spyrou
Keyword(s):  
Design Methodology ◽  
Dynamic Instability ◽  
Global Analysis ◽  
Theoretical Background ◽  
Dynamic Effects ◽  
Arbitrary Initial Condition ◽  
Forced Turn ◽  
Surf Riding ◽  
Ship Roll ◽  
Ship Capsize

In earlier studies we have analyzed the phenomena which can generate loss of ship controllability in astern seas. In this paper we examine how the yaw instability associated with broaching can lead to roll instability and ship capsize. The dynamic effects responsible for capsize during the forced turn of broaching do not have their origin in the customary roll equation but are the result of interactions with other motions of the ship. Stability studies based solely on the roll equation are thus clearly inappropriate for this case where a multidimensional approach is deemed necessary. After presenting the theoretical background we set out a multi-degree method of global analysis which is based on transient maps. We apply this method to clarify how capsize occurs during the escape from surf-riding and also during transients from arbitrary initial condition of the ship. Our study establishes the connection between speed, heading, automatic control parameters and capsize. The proposed method can be useful in the context of a design methodology for minimizing the risk of ship capsize in astern seas.

scholarly journals OPTIMUM CONDITIONS FOR SURF-RIDING AND INVESTIGATION OF DISAPPEARANCE OF PAST SURF SPOT AT MAEBARA BEACH

2000 ◽  
Vol 16 ◽  
pp. 553-558
Author(s):  
Shu-suke WATANABE ◽  
Satoquo SEINO ◽  
Takaaki UDA ◽  
Masumi SERIZAWA ◽  
Toshiro SAN-NAMI ◽  
...  
Keyword(s):  
Optimum Conditions ◽  
Surf Riding

Improved prediction of the threshold of surf-riding of a ship in steep following seas

2010 ◽  
Vol 37 (13) ◽  
pp. 1103-1110 ◽  
Author(s):  
Wan Wu ◽  
Kostas J. Spyrou ◽  
Leigh S. McCue
Keyword(s):  
Following Seas ◽  
Surf Riding
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