巻号一覧
33 巻 (1977 - 1978)
- 4 号 p. 175-
- 3 号 p. 117-
- 2 号 p. 61-
- 1 号 p. 1-
33 巻, 2 号
選択された号の論文の8件中1～8を表示しています
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小林 哲夫1977 年 33 巻 2 号 p. 61-66
発行日: 1977/09/15
公開日: 2010/02/25
ジャーナル フリー干陸が予定される中海北西域沿岸に位置する本庄地域は, 背後を標高200～500mの山地で囲まれた水田地帯で, 局地的な気候が発達しやすい地形的特徴を備えている。この地域の気温特性を調査し, 干陸の影響を評価するために, 地域内外に8か所の観測点が設定され, 4年間にわたる気温観測が行われた。結果は次のように要約される。
(1) 本庄地域の気温は年間を通じて中海の影響を受けているが, その程度は季節的に変化し, 天気に依存する。日最低気温に対する影響は春季と秋季に明確に現われ, 特に静穏かつ放射型の天気の下で活発になる。日最高気温に対する影響は, 湖面水温が相対的に低い晩冬から春季にかけて, あまり強くない湖からの風の下で著しい。
(2) 中海がこの地域の日最低気温に影響する機構は複雑であるが, 気団の性質など, 局地的循環系が発達するための条件が重要な役割を果していると考えられる。一方, 日最高気温の場合は単純かつ直接的で, 湖面水温と風向風速が決定因子になる。抄録全体を表示PDF形式でダウンロード (691K) -
三原 義秋, 鶴田 孝一, 根本 修1977 年 33 巻 2 号 p. 67-74
発行日: 1977/09/15
公開日: 2010/02/25
ジャーナル フリーA large orchard of satsuma mandarin located nearest the sea coast of the southern end of Kyushu was completely destroyed by the early frost on the two successive nights in November, 1968. The orchard of 72 hectare area in an artificially flattened dune, 5m above sea level, is divided into 60 rectangular sections; each section, 100m wide and 120m long, is surrounded by a pine-tree hedge 6-8m high and is partitioned further into nine small parts by 1.8m high plastic-net windbreaks set up in two lines and two rows. Under such a perfect protection against wind hazard, about 200 thousand young mandarin trees were planted in the autumn of 1967 and the spring of 1968.
In September of 1968 a typhoon, passing off the sea coast to the north, swept the orchard; however, wind hazard was very slight, only faint discoloration was recognized on leaves during a few weeks after the typhoon.
Unusual severe frost occurred on 15th and 16th of November after a warm spell of about ten days. Nearly 85 percent of mandarin trees in the orchard were injured; most of their trunks were frozen to death. Thus the orchard was destroyed and abandoned one year after establishment. Awful damage due to the early frost, however, was restricted within the orchard with windbreaks on the dune. Significant hazard was hardly recognized in many other orchards on the hillsides adjacent to the destroyed one.
To make clear the reason for severe frost damage in the orchard with cautious windbreaks, observations were done for several nights both in the ruined orchard and on another flat ground with model windbreaks. We come to the conclusions that the night land-breeze, generally called cold air flow, lessens in reality the night chilling of the air near the ground surface, and that much obstruction to the breeze by windbreaks such as in the above mentioned case will cause fabulous coldness on the leeward side of the windbreaks on nights when radiation cooling is prevailing.抄録全体を表示PDF形式でダウンロード (4795K) -
長谷場 徹也1977 年 33 巻 2 号 p. 75-79
発行日: 1977/09/15
公開日: 2010/02/25
ジャーナル フリーEvaporation rates from isothermal wet surfaces of circular and square plates were measured in laminar air-flow parallel to the surface, in order to clarify the dimension dependence of water-vapor transfer coefficients on the flat leaf of small dimensions for forced-convection.
Below a critical Reynolds number of about 2×104, the average forced-convection transfer coefficient is proportional to the 0.5 power of wind speed.
The average transfer coefficients for circular and square models of larger dimensions with a diameter/side-length above 5 to 7cm agree with the predicted values from the “approximate boundary layer theory”. For smaller models with dimensions below 5 to 7cm, however, the observed coefficients are larger than the predicted. The ratio of the observed coefficient to the predicted one (α) becomes larger as the model dimension (l, cm) decreases. A relation between them leads to α≅1.2l-0.09.
Some experiments on evaporation from the square wet surfaces whose leading edges made part of that of a larger rectangular plate showed that a relative increase in the transfer coefficient could be partly caused by the turbulent transport of vapor around the model edges.抄録全体を表示PDF形式でダウンロード (481K) -
岩切 敏1977 年 33 巻 2 号 p. 81-85
発行日: 1977/09/15
公開日: 2010/02/25
ジャーナル フリーPDF形式でダウンロード (672K) -
昭和50年度日本農業気象学会秋季大会シンポジウム (I)1977 年 33 巻 2 号 p. 87-97
発行日: 1977/09/15
公開日: 2010/02/25
ジャーナル フリーPDF形式でダウンロード (1671K) -
1977 年 33 巻 2 号 p. 98
発行日: 1977/09/15
公開日: 2010/02/25
ジャーナル フリーPDF形式でダウンロード (118K) -
真木 太一1977 年 33 巻 2 号 p. 99-101
発行日: 1977/09/15
公開日: 2010/02/25
ジャーナル フリーPDF形式でダウンロード (2270K) -
1977 年 33 巻 2 号 p. 102
発行日: 1977年
公開日: 2010/02/25
ジャーナル フリーPDF形式でダウンロード (84K)
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