4 results
Search Results
Now showing 1 - 4 of 4
Item 桃園海岸林分發展與地形變遷之關聯性研究(1978~2004)(國立臺北大學公共事務學院地政學系, 2011-05-01) 莊永忠; 林雪美; 沈淑敏; 廖學誠海岸林分發展與環境變遷息息相關，地形即為重要影響因子之一。本研究透過地理資訊圖層套疊呈現1978∼2004年間桃園海岸林分空間分布變化，探討其與地形變遷之關聯性，並對照林務局歷年保安林總成圖層分析造林地規劃之適宜性。結果顯示桃園海岸之林分在二十六年間因濱線內移致使林分前緣持續後退，其中又以草漯海濱、觀音工業區外濱海位置（富林溪口至大堀溪口，海湖底與樹林子）、以及觀音溪口至小飯瀝溪口段最為嚴重。而沙丘後退內移，以及沙丘位置之林木生長條件不佳亦造成林分受害，致使林帶寬度大為縮減，因而大幅降低林分阻隔飛沙與固定沙丘之能力。而對照林務局歷年保安林造林台帳圖後，亦發現許多保安林邊界已不符合近年海岸變遷與林分發展趨勢，應視目前情況進行擴編或解除，以利當地長期之林分發展。Item 臺灣北部海岸沙丘之地形學研究(地理學系, 1992-03-??) 石再添; 張瑞津; 林雪美; 張政亮; 連偵欽Item 臺灣西部海岸沙丘之地形學研究(地理學系, 1993-06-??) 石再添; 張瑞津; 張政亮; 林雪美; 連偵欽Coastal sand dunes are widely distributed along the western coast of Taiwan from Touchien Hsi to Erhjen Hsi. Based on maps work, airphoto interpretation, particle size analysis, field investigation, etc, the study results are summarized as follows: 1. The form and the magnitude of the western coastal sand dunes have close relationship with the source of 13 rivers' sand supply, alongshore current and wave action, power and direction of wind, terrains, rainfall, evaporation and vegetation. 2. The coastal dunes develop well on riversides of Chung Kang His, Holung Hsi, Choshui Hsi and offshore bars along Chianan coast. Two principal types of these dunefield may be distinguished, namely, active dunes and stabilized dunes. The two dunefield types contain a variety of dune features, such as transverse dunes, barchans, longitudinal dunes, and dome dune etc. 3. The grain sizes of beach and dune sand are quite uniform. The Md φ and δ φ on average of the dune sand is smaller than the beach sand. This shows that wave process is stronger than wind process. 4. Comparing the maps published in 1926 and 1984. the change of coastal dunes is clear. Because the dunefield was used as fishery or watermelon and sugarcane planting, most of the sand dunes were leveled off entirely. Some of the residual sand dune still exist at present fixed by windbreak forest. For sand dunes have the function of protecting coasts, they had better be well-planned and well-used so as to main-tain the sustainable utilization of land souces.Item 桃園海岸林分發展與地形變遷之關聯性研究(1978~2004)(國立臺北大學公共事務學院地政學系, 2011-05-01) 莊永忠; 林雪美; 沈淑敏; 廖學誠海岸林分發展與環境變遷息息相關，地形即為重要影響因子之一。本研究透過地理資訊圖層套疊呈現1978∼2004年間桃園海岸林分空間分布變化，探討其與地形變遷之關聯性，並對照林務局歷年保安林總成圖層分析造林地規劃之適宜性。結果顯示桃園海岸之林分在二十六年間因濱線內移致使林分前緣持續後退，其中又以草漯海濱、觀音工業區外濱海位置（富林溪口至大堀溪口，海湖底與樹林子）、以及觀音溪口至小飯瀝溪口段最為嚴重。而沙丘後退內移，以及沙丘位置之林木生長條件不佳亦造成林分受害，致使林帶寬度大為縮減，因而大幅降低林分阻隔飛沙與固定沙丘之能力。而對照林務局歷年保安林造林台帳圖後，亦發現許多保安林邊界已不符合近年海岸變遷與林分發展趨勢，應視目前情況進行擴編或解除，以利當地長期之林分發展。