平塚沖波浪観測資料(6)(1984.9〜1986.8)

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Wind wave observation at the Hiratsuka Marine Observation Tower has been conducted continuously since 1978, and data report of its results were published in five back-number issues of 'Review of Research For in five back Prevention' (Nos.38, 47, 59, 107, 123). This issue contains those data for the period from September 1984 to August 1986. Descriptions of the tower are presented in Figs.1 and 2. An electric capacitance type wave gauge is used for the wave measurements. Its sensor is essentially a single copper wire of 5 mm diameter with plastic coating and is suspended vertically from an arm of the tower into the water (Fig.2 (a)). The characteristic curve of the wave gauge is illustated in Fig.3. Wind speed and direction are measured by an Aero-vane type anemometer on a mast at the top of tower where the height above the mean sea surface is 22.5 m. Atmospheric pressure presented here are measured at the base laboratory on the land. Wind and wave data measured on the tower are transmitted to the base laboratory through the submarine cable, and acquired in a computer at a rate of every 0.3 seconds for each channel in on line, real-time base. Analysed results are presented as follows : (1) Events of rough sea condition occurring during the period are described in Table 1. (2) Monthly traces of the changes of significant waves, atmospheric pressures and winds are shown in Fig.6. One over three significant wave heights are caliculated from 20 minutes wave data centered at each even hour. A mean wind direction and speed for 10 minutes centered at an even hour of every 3 hour are indicated by a vector. (3) Correlations between wave heighes and periods of significant waves during each mouth are protted in Fig.7 (4) Monthly wind-roses are shown in Fig.8. The upper figure implies a frequency distribution of cases of wind direction values observed and the lower shows a directional distribution of mean wind speeds for cases of each direction, during each month respectively. (5) Frequency distribution of the relation between wave heights and wave periods of significant waves is classified in Table 2. Each dot in Fig.7 is classified and counted for every 30 cm of wave heights and for every 1.0 second of wave period.
独立行政法人防災科学技術研究所の論文
1989-03-30

平塚沖波浪観測資料(6)(1984.9〜1986.8)

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