Study on Effects of Vegetation on Atmospheric Circulation

植被对大气环流影响的研究

• 批准号: 08650591
• 负责人: KOBATAKE Shigeki
• 金额: $ 1.6万
• 依托单位: Gunma University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08650591/
• 关键词: Atmospheric circulation; Vegetation effects; Observations of micro-climate; シミュレーション; 気候緩和; 森林効果

In order to develop a simulation model to estimate the role of vegetations on atmospheric circulation, observations of micro-climate were carried out in a grove and outside the grove. The results obtained are as follows. 1.Temperature in a grove is lower compared to outside the grove in the day time. After3-4pm.temperature in a grove becomes higher compared to outside the grove and this state continues to sunrise of next morning. The phase difference of temperature variation between inside and outside the grove is about 30 minutes. In the case of strong wind such as thunderstorm, the temperature of inside the grove changes immediately with temperature of outside. 2.The eddy diffusivity was estimated using Profile relations and daily changes of heat and moisture flux near the crown were calculated. The results seemed to be adequate. 3.The net radiation during day time was around 30-40w/m^2 inside the grove. 4.Soil temperature of 5cm under the ground surface changed 1ﾟC,meanwhile, soil temperature of same position outside the grove changed 4-5ﾟC.5.The simulation model of air flow is under construction using 3-dimensional LES model. In future, the heat-balance equations must be taken into account.

为了开发模拟模型来估计植被对大气环流的作用，对树林内和树林外的微气候进行了观测。得到的结果如下。 1.白天，树林里的温度比树林外低。下午3-4点后，树林内的温度比树林外更高，这种状态持续到第二天早上日出。林内外温差相差约30分钟。当遇到雷雨等大风时，树林内的温度会立即与室外的温度发生变化。 2.利用剖面关系式估算涡流扩散率，并计算冠部附近热湿通量的日变化。结果似乎已经足够了。 3.树林内白天净辐射约为30-40w/m^2。 4.地表以下5cm土壤温度变化1℃，同时林外同一位置土壤温度变化4-5℃。5.气流模拟模型正在采用三维LES模型构建。将来，必须考虑热平衡方程。

项目成果

M.O.Nyadawa: "Estimating Transmission Losses in the Channel of River Tana, Kenya" Journal of Japan Society of Hydrology & Water Resources. Vol.10 No.2. 161-173 (1997)

M.O.Nyadawa：“估算肯尼亚塔纳河河道的传输损失” 日本水文学会杂志

Shigeki Kobatake and others: "Effect of Absorption of Light on River Water Temperature" Annual Journal of Hydraulic Engineering, JSCE. vol.41. 599-604 (1997)

Shigeki Kobatake等人：“光吸收对河水温度的影响”水利工程学年刊，JSCE。

小葉竹 重機: "植生の回復に伴う流出特性の変化" 土木学会水工学論文集. 第42巻(印刷中). (1998)

Kobatake，重型设备：“植被恢复引起的径流特征变化”，日本土木工程师学会水利工程学报，第 42 卷（出版中）。

小葉竹重機: "河川水温の形成過程における光の水中吸収率の影響" 土木学会水工学論文集. 第41巻. 599-604 (1997)

小畠重机：“水下光吸收率对河水温度形成过程的影响”，日本土木工程学会水利工程学报，第 41 卷，599-604（1997 年）

M.O.Nyadawa, Shigeki Kobatake and Kazuhiro Ezaki: "Estimating Transmission Losses in the Channel of River Tana, Kenya" Journal of Japan Society of Hydrology and Water Resources. Vol.1O,No.2. 161-173 (1997)

M.O.Nyadawa、Shigeki Kobatake 和 Kazuhiro Ezaki：“估算肯尼亚塔纳河河道的传输损失”日本水文水资源学会杂志。