昭和63年に津軽海峡東口で発生した，ケミカル・タンカーからのスチレン・モノマー流出事故につ いて事例分析を行った． 海上における危険物流出事故対応には，陸上における事故とは異なる側面があり，対応策を検討するために更なる情報を必要とする． 海水温度，塩分濃度，海潮流，吹送流，風圧流，海水温度における流出液体の蒸気圧，密度，粘度といった情報が必要であることが判明した．

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This report summarizes the result of drift-bottle experiments at the west entrance of Tugaru Strait, Hokkaido, Japan, which were carried out twelve times during May 1956 to March 1957, where 1200 drift-bottles were dropped.
There are two types of recovering of drift-bottles, the one is “SUMMER TYPE” and the other is “WINTER TYPE”. 452 drift-bottles were recovered and 32.5% of them were drifted to the coast of Japan Sea, 39.4% to the coast of Tugaru Strait and 28% to the coast of Pacific. During February, they were drifted mostly to the coast of Japan Sea, during October and November to the coast of Tugaru Strait and during May and January to the coast of Pacific. The state in which the current of Tugaru Strait branches from the Tusima current is very changeable depending on time and place.

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A person in a shallow beach near shoreline at Moheji Coast in Hokkaido died due to wave that had ordinary height in November, 2008. In order to reproduce the situation of the fall accident in a shallow beach, two-dimensional hydraulic model tests and numerical calculation were carried out to examine the wave force on a human body. The fall limit ratio was newly proposed for estimating the qualitative risk of person's fall accidents, and its applicability was confirmed. Based on these results, possibilities of person's fall accidents with ordinary waves were confirmed, and the safety tide level was shown for some wave conditions. A basic idea of the safety management was also proposed for shallow beach.

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This paper describs the analysis of the experiment about the ship's rolling motions induced by waves which was performed on September 5th, 1959 in Tsugaru Straits. The experiment consisted of the observations for wave heights and measurement of ship's rolling angles. For analysing the results of the experiment, statistical and spectral methods were used. As to the observations of waves, the photographs of Froud's wave pole were taken by a 8mm cine camera with a specially designed shutter, by which the successive records of every second were obtained for about 10 minutes long ; and as to ship's rolling motions, a pendurum type rolling angles recording meter was used. From the records which were obtained and measured by the above noted methods, the apparent periods and amplitudes of waves and rolling angles, the following items were calculated and discussed ; 1) The highest, 1/10 average, 1/3 average and average value of wave heights and rolling angles. 2) The energy spectra of wave heights and rolling angles.

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鹿部冲の海底に分布する北海道駒ヶ岳火山1640年の岩屑なだれ堆積物を調査した音波探査の結果,海底岩屑なだれ堆積物の分布の末端部を確認することに成功したこれらは溶岩流などに認められる急勾配の末端崖は示さないものの,傾斜の変化を示す海域に分布する流れ山は岩屑なだれ堆積物分布末端部では存任せず,流走距離に反比例して規模・分布頻度が小さくなる傾向を示す海域における岩屑なだれ堆積物の分布は,主方向が北東方向と東方向の双頭状の分布を示し,給源からの最大水平流走距離は約20km,最大幅は約15km,分布面積は約126km²であるH/L比は0.06であり,海底を流走した岩屑なだれは同規模の陸上岩屑なだれより流動性が高い傾向がある実際に海中に流入した体積は,探査から求めた海底地形データによって見積もった体積に,薄く広がった部分と流れ山の体積を加えた0.92～120km³と見積もられた

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Hokkaido, one of the largest islands in the North of Japan, was a sparsely populated district before Com. Perry's visit to Japan, 1853. But after the gate was opened many foreigners-American, Engliish, etc. -began to call at Hokkaido. We owe the cultivation there to many foreigners, especially to Americans as our advisors and teachers in the 19th century. A brief sketch of the English studies in Hokkaido is given in this short article

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