碩士 / 國立中興大學 / 水土保持學系所 / 94 / Nanbin Park and Chi-Sing Tang are famous for sightseeing spots in Hualien. In order to understand the efficiency of the mound facilities of Nanbin Park and the windbreak of Chi-Sing Tang, a multi-layer anemometer and salt collectors were used in this study to investigate changes in wind velocity and salinity occurring at varying distances for 2 types of mounds and windbreaks located in areas with different topographic characteristics.
About the mound facilities of Nanbin Park, the wind velocity survey showed that owing to the mound alignment being nearly parallel to the wind direction (the included angle was only 5o), the wind reduction was not substantial. The wind velocity at the windward side of the mound decreased an average of about 32% and 38% for rounded and slender mounds, respectively. The wind velocity on the leeward side of the mound was reduced by up to 25% on average within 156 m because of the insignificance of the flow compression effect not caused by topographic lifting. The salinity reduction on the leeward side of the round mound reached 50%, and was 60% for the leeward side of the slender mound. Therefore, salt reduction showed better performance compared with wind velocity reduction. The salinity observed at the wind gap decreased with the increasing of distance from wind gap, but between round and slender mounds, no significant difference was detected.
About the windbreaks of Chi-Sing Tang, the average wind and salt reduction already reached 90% at 140 m inside it; furthermore, the salt content of beefwood, in the soil and the amount of floating all increase with the horizontal distance but decrease progressively and descend 10 mg/100ml at 150 m; however, the average temperature and ground temperature is 2℃ higher, and the water content in soil is about 0.4% higher inside the forest belt than the outside of it; the trend of the atmospheric pressure and opposite moisture is the same, but the illumination is only 1/215, and the radiation is 1/20 of that of the outside forest belt.
The wind velocity and salinity reduction functions can be achieved only if the alignment of the mound is perpendicular to the wind direction and oweing to have efficiency of adjusting microclimate in coastal windbreak, so it is suitable to build and offer the high-quality natural recreation environment.
| Identifer | oai:union.ndltd.org:TW/094NCHU5080037 |
| Date | January 2006 |
| Creators | Zhen-Yong Lai, 賴振墉 |
| Contributors | 黃隆明 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 80 |
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