地理研究
Permanent URI for this collectionhttp://rportal.lib.ntnu.edu.tw/handle/20.500.12235/194
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Item 臺灣的河川流域之降水量與逕流量形式(地理學系, 1988-03-??) 陳國彥A climograph method using amount of precipitation and height of runoff is introduced to depict the river basin characteristics of Taiwan. Four regions are classified and the research findings are summarized as follows: 1. North region: Typical examples include Lan-Yang His, Tan-Shui Ho, and its tributaries. Amount of precipitation and height of runoff are evenly distributed throughout the year with maxima found in June and September. There is no obvious drought season and the rivers flow all year around in this region. 2. Central region: This region includes river basins of Tou-Chien His, Hou-lung His, Ta-An His, Ta-Chia His, Ta-Tu His, and Cho-Shui Hsi. A bi-peak curve also presents in the graph which shows a maximum in June and a sub-max in August. Seasons of high water discharge and low water discharge are not so clear-cut as those in the south region, however, dry bed river can occassionally be found during the low water discharge season. 3. South region: It includes the area from south of Pei-Kang Hsi to the southern tip of the island. The graph also shows a bi-peak curve with August maximum substantially higher than the other. The amount of precipitation and the height of runoff are cIose to nill in winter. It is regarded as a typical dry bed river region. 4. East region: A mono-peak curve is found in this region. Precipetition and runoff are more evenly distributed than west-coastal area in the same latitude, however, summer maximum is still distinct. The characteristics of river basin in Taiwan are in close relation to the monsoon climate and to the effect of island's topography. The graph shows a summer high water discharge and a winter low water discharge with great difference between them. There generally shows two maxima in a graph with one occurring in June while the other in August. This type of river flow is considered to be suitable and beneficial to the agricultural and the economic development in Taiwan, partItem 臺灣的季節分類試論(地理學系, 1987-03-??) 陳國彥In this essay, it is attempt to classify the climate in Taiwan into several seasons reasonably. Among all the climatic elements which affect the human body, the wet bulb temperature is the most important one. The sensible temperature varies very much and hard to measure by any instrument. But, there is a high correlation between the sensible temperature and wet bulb temperature. Taking all these factors into consideration. the wet bulb temperature is the most suitable elements to descrive the human sensation and to classify the seasons of climate. From the point of view of the wet bulb temperature, it is sugested that the Taiwan's climate could be devided into six seasons, such as winter, spring. pre-summer, mid-summer, post-summer and autumn.Item 臺灣的柯本氣候機率分類(地理學系, 1986-03-??) 陳國彥Item 臺灣之乾燥度(地理學系, 1989-03-??) 陳國彥When the guaranty moisture condition of a region is evaluated, besides the annual or seasonal income of precipitation, one should also take into consideration the expenditure of soil moisture. By this way, it will be more comprehensive than just using precipitation as a factor to evaluate the moisture resource of a place or of different seasons. This paper adopts the ratio of Thornthwaite's potential evaportranspiration and precipita?tion as the criteria for aridity in order to calculate the aridity of Taiwan: 1. When aridity equals 1, it denotes that the potential evaportranspitation and the precipi-tation are the same, and the climatic environment is good. 2. When aridity is less than 1, i.e., potential evapotranspiration is smaller than precipitation, then there is a humid climate and dry crops generally do not need irrigation, which is only practiced in paddy fields. Drainge should be kept in mind at flat lands. 3. When aridity is more than 1, potential evapotranspiration is larger than precipitation and there will be water deficit. Measures to prevent drought is a necessity. Most part of Taiwan belongs to humid region, with exception in the winter of Southwestern Taiwan where arid region exists. This shows that “aridity” can be a very good criterion.