scholarly journals MODEL HARBOUR SEICHING COMPARED TO PROTOTYPE DATA

1984 ◽  
Vol 1 (19) ◽  
pp. 57
Author(s):  
W.A.M. Botes ◽  
K.S. Russell ◽  
P. Huizinga
Keyword(s):  
South African ◽  
Nuclear Power ◽  
Cooling Water ◽  
Long Waves ◽  
Power Station ◽  
The West ◽  
Pressure System ◽  
Long Wave ◽  
Low Pressure System ◽  
Harbour Resonance

Since 1978 a finite-difference numerical model based on that developed by Leendertse and adapted for resonance studies (Russell and Huizinga, 1978) has been applied to investigate harbour resonance in Table Bay Harbour and several other South African ports. During April 1981 three long-wave recorders were installed in the cooling water intake basin of the Koeberg Nuclear Power Station to determine the occurrence and magnitude of the long waves and to measure the corresponding response of the basin. Koeberg is situated on the west coast of South Africa, 30 km north of Cape Town and is exposed to the approaching cyclonic weather systems which experience has shown to be associated with the occurrence of long waves. An example of an approaching low pressure system with the location of Koeberg is shown in Figure 1.

scholarly journals RESONANCE IN SOUTH AFRICAN HARBOURS

1982 ◽  
Vol 1 (18) ◽  
pp. 29
Author(s):  
W.A.M. Botes ◽  
K.S. Russell ◽  
P. Huizinga
Keyword(s):  
Numerical Model ◽  
South African ◽  
Nuclear Power ◽  
Wind Waves ◽  
Cooling Water ◽  
Long Waves ◽  
Single Wave ◽  
Model Studies ◽  
Advantages And Disadvantages ◽  
Transport Services

The geographic situation of Southern Africa, and the associated climate of the South Atlantic Ocean, cause the harbours on the west and south coasts of South Africa to be subjected to resonance or range action caused by longperiod 50 s to 300 s waves. Since the construction of Duncan Dock in Table Bay in 1940, Table Bay harbour has become a classical example of resonance. Range action in the harbour has been studied extensively in the past and extensive physical model studies were undertaken to optimise the layout of the Schoeman Dock, construction of which was completed in 1976. In 1976 South African Railways and Harbours (now South African Transport Services) commissioned the Coastal Engineering and Hydraulics Division of the National Research Institute for Oceanology to optimise plans for future extensions to Table Bay harbour. As a preliminary study, the advantages and disadvantages of all existing methods of simulating resonance were reviewed. For this investigation it was decided to adapt an existing "finite difference" numerical model developed by Leendertse (1967). Prototype long-wave data were gathered in Table Bay and at a later stage at the cooling water intake basin of the Koeberg Nuclear Power Station. These data were used to calibrate the numerical model and an attempt was made to find a correlation between long waves and short wind waves in order to determine the frequency of occurrence of long waves. A method was also developed to incorporate a range of frequencies in one model-run instead of single wave input conditions. This resulted in a considerable reduction of expense and time.

Ceasefire may ultimately dislodge Turkey from Syria

2020 ◽  
Keyword(s):  
Decision Making ◽  
Nuclear Power Station ◽  
Nuclear Power ◽  
Power Station ◽  
The West ◽  
Content Type ◽  
Economic Relations ◽  
Complete Breakdown

Significance Over the last two months, President Recep Tayyip Erdogan has deployed Turkish military resources to Libya and the Syrian governorate of Idlib in an attempt to prevent Ankara’s allies and proxies from being overrun by superior forces. Both initiatives have been poorly formulated, shaped more by personal ambition than Turkey’s capabilities, and have reinforced already serious concerns about decision-making in the presidential palace. Impacts Tensions in Idlib will mean further compartmentalisation, rather than a complete breakdown, in the Ankara-Moscow relationship. Turkey will still purchase Russian S-400 air defence systems, but they may become operational later than the scheduled date of April 2020. Russia’s completion of Turkey’s first nuclear power station may be further delayed though economic relations will be largely unaffected. Despite tensions with Russia, there is no prospect of much improvement in relations with the West while Erdogan is in power. Turkey will be neither willing nor able to intervene decisively in the Libyan conflict.

scholarly journals Mountain torque events in the Mediterranean

2007 ◽  
Vol 12 ◽  
pp. 39-42 ◽  
Author(s):  
J. Egger ◽  
K. P. Hoinka
Keyword(s):  
Rotation Axis ◽  
Potential Temperature ◽  
Western Mediterranean ◽  
The West ◽  
Pressure System ◽  
Temperature Changes ◽  
Low Pressure System ◽  
The Alps ◽  
The Mediterranean ◽  
Upper Level

Abstract. Typical events of torques exerted by the Alps are analysed by correlating flow observations in the Mediterranean with these torques. More specifically, events with positive torques with respect to the "rotation axis" at 90° E, 0° N in fall are selected. A trough forms above the western Mediterranean during such an event with a ridge in the west. A separate low pressure system is induced in the lee of the Alps which moves then eastward with the upper-level trough. A linear forecast equation based on potential temperature changes reveals that this Alpine "lee cyclone" is mainly due to warm air advection east of the trough. Precipitation is discussed as well.

scholarly journals Seaweed ingress of cooling water intakes with predictions for Torness power station

2021 ◽  
Author(s):  
Nikolaos Spanakis ◽  
Peter K. Stansby ◽  
Benedict D. Rogers ◽  
Pietro Bernardara
Keyword(s):  
Nuclear Power ◽  
Narrow Range ◽  
Cooling Water ◽  
Power Station ◽  
Threshold Velocity ◽  
Power Stations ◽  
Sea Bed ◽  
Local Measurements ◽  
Induced Currents ◽  
Wave Induced

AbstractSeaweed ingress into the cooling water intakes of nuclear power stations has caused several disruptions to electricity supply. Seaweed is transported by tidal and wave-induced currents after dislodgement from the sea bed following stormy conditions but ingress will be shown to be not only determined by wave conditions. An integrated model system has been developed to predict such ingress and applied at the Torness power station in Scotland where the mass of seaweed recovered was measured for some ingress cases. Prior to each case, seaweed is assumed initially to be distributed in areas surveyed within the surrounding coastal domain with a mass per unit area based on local measurements. Criteria for dislodgement are based on near-bed velocity. Six cases where the mass of ingress was measured and two cases with no ingress have been modelled and predicted by adjusting a dislodgement factor (a multiplier on the threshold velocity) within a relatively narrow range.

Estimation About Amounts of Radioactive Wastes From Fukushima Daiichi Nuclear Power Station

2016 ◽  
Author(s):  
Taichi Sakai ◽  
Shunichi Suzuki ◽  
Koji Okamoto
Keyword(s):  
Migration Rate ◽  
Nuclear Power ◽  
Cooling Water ◽  
Radioactive Wastes ◽  
Power Station ◽  
Current Standard ◽  
Migration Rates ◽  
Elapsed Time ◽  
Fukushima Daiichi ◽  
Almost All

In this research, the amounts of the radioactive wastes generated by the secondary wastewater treatment was focused on. In this paper, at first, cooling water circulating in the plant and the facilities which are removing radionuclides were modeled and how the radionuclides migrate with elapsed time was formulated. Then, the analytic value was fitted to the measured value to compute undetermined coefficients of the formula by setting a migration rate of these nuclides leaching from fuel debris as the parameter for this calculation. Secondly, based on the above calculated inventory, the concentration of those nuclides per vessel was estimated and classified, supposing that the current standard of waste classification for disposal in the normal decommissioning can be applied even for this accident. In this case, the stabilization processing of wastes inside the vessels was not taken into consideration, and these were presumed to be restored directly. By this fitting, the results show that the migration rates of Cs-137 and Cs-134 are 24.4 TBq / day and 10.5 TBq / day. And the classification results indicate that the concentrations of almost all vessels are classified as the equivalent of pit disposal or trench disposal group.

scholarly journals Interaction of a Low-Pressure System, an Offshore Trough, and Mid-Tropospheric Dry Air Intrusion: The Kerala Flood of August 2018

Atmosphere ◽  
2020 ◽  
Vol 11 (7) ◽  
pp. 740 ◽  
Author(s):  
Vinay Kumar ◽  
Prabodha Kumar Pradhan ◽  
Tushar Sinha ◽  
S. Vijaya Bhaskara Rao ◽  
Hao-Po Chang
Keyword(s):  
West Coast ◽  
Central India ◽  
Low Pressure ◽  
Western Coast ◽  
Gujarat State ◽  
The West ◽  
Pressure System ◽  
Dry Air ◽  
East Region ◽  
Low Pressure System

The present study examines the Kerala Flood Event (KFE, 15–16 August 2018, in India) that occurred along the west coast of India and resulted in ~400 mm of rainfall in one day. The KFE was unique in comparison to previous floods in India, not only due to the rainfall duration and amount, but also due to the fact that the dams failed to mitigate the flood, which made it the worst in history. The main goal of this study is to analyze and elucidate the KFE based on meteorological and hydrological parameters. A propagating low-pressure system (LPS) from the Bay of Bengal (BoB) caused the streak of plenty of rainfall over Kerala, the west coast, central India, and the BoB. Additionally, the upper-tropospheric anti-cyclonic system over the Middle East region inhibited a northward advancement of LPS. On the western coast of India, a non-propagating (with diurnal fluctuations) offshore trough was observed over the west coast (from Kerala to Gujarat state). Therefore, a synergic interaction between LPS, an intrusion of dry air in the middle-troposphere, and the offshore trough was the main reason for KFE. However, after around ten days, rainfall saturated the dam capacities; thus, the released water, along with the amount of precipitation on the day of the event, was one of the other possible reasons which worsened the flood over Kerala.

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