地理研究

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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.
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
臺灣南端與東部海岸沙丘之地形學研究
(地理學系, 1994-03-??) 石再添; 張瑞津; 張政亮; 連偵欽; 林雪美
This paper is the third year's study of "The geomorphological study of coast sand dunes of Taiwan". The study areas include the eastern and southernmost coasts of Taiwan. Based on airphoto interpretation, particle size analysis, field studies etc., the results are summarized as follow: 1.In Southern Taiwan, most of the streams are short, and supply only a little sand. The eastern coast of Taiwan is fault coastline, so there are any cliffs along the coast. The extension of sand dunes is not so wide as that in the western and the northern Taiwan. 2.In southern coastal area, most of sand dunes are distributed on the plain near river mouths and on the coral reef platforms, such as Hai-kou, Chiu-peng, and Fou-chiu-sa, ets. Various types of dunefields: dome dunes, barchans, andfalls, and pseudo dunes were easily observed there. The supply of sand come from the shelly fragments and mineral grains by coastal erosion and suspended sediment. The sizes of the gray and white color particles in the southern coastare smaller than those in the eastern coast. 3.The sand dunes n the eastern faulted coast are distributed only on the plain near river mouths like Pei-pu and Chih-pen. Most of the sand supplies come from suspended sediment. The sizes of the particles with gray and black color are bigger than those in the southern coast. The features of dunefields are simple only gradual undulation along shoreline.4.Because of the dunefield was used as fishery, watermelon planting and cemetery, most of the sand dunes were leveled off entirely. Some of the residual sand dunes were stabilized by windbreak forest. For sand dunes showing a function of protecting coasts, they had better be well-planned and well-used so as to maintain the sustainable utilization of landsources.

地理研究

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