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엄원탁 영남대학교 공업기술연구소 1973 연구보고 Vol.1 No.1
大邱市 新川의 下水道化와 下流水域에 미치는 水質汚濁은 早速히 解決되어야 할 重要課題로 되어 있다. 本論文은 新川의 河川地形的 特性과 dam에 依한 水資源利用에 關해서 考察하였다. 그 結果 新川流域은 山地河川의 特性을 갖었으며 無效流出이 크다는 것을 알았다. 한편 新川流入 汚水는 將次 日平均 181,400㎥로 推定되고 淨化對策이 必要을 示唆하고 있다. 또한 上流 雨溪谷(本流冷泉, 龍溪川)에 dam을 築造하고 流出을 均等化 시킨다면 新川河幅은 現在의 ⅓程度로 縮小 可能하고 開發의 餘地가 있음을 알았다. The Sin Chon that is changing its function to a sewage and extending seriously its water pollution to the downstream and that lies through Taegu city, has become an important subject to be settled for the improvement of city surroundings. In this paper a primary study about topographical attribute and utilization of water resources of the Sin Chon was made the conclutions are as follows: (1) The river basin of the Sin Chon shows a character similar to that of mountainous district rivers; 330m of mean elevation, 0.215 of shape factor, 0,584 of compactness, and 1/20∼1/200 of longitudinal slope. (2) The Sin Chon keeps relatively stable water way on account of the geological property of the river basin changing its stage from mature to old. (3) The average annual runoff factor ranges 55∼60%; a large portion of the discharge from the river basin is wasted effectlessly. (4) The sewage discharge into the Sin Chon is presumed to be up to 181,400㎥/day 2.1㎥/sec.) in 1980. The sanitary sewer section 1.40×0.85m was calculated for the drain of that sewage. (5) The dam capacity to take a complete averge discharge can be determined by the sum of 4.28×10 from the Yong Ke Chon river basin; an average flow is expected to be 1.58㎥/sec. (6) The river width of the Sin Chon can be curtailed to one third of present one after the construction of discharge control dam.
嚴元鐸 嶺南大學校 工業技術硏究所 1976 연구보고 Vol.4 No.1
The rainfall storms data of short duration are mainly used in the design of urban sewer and spillway of small reservoir. In the fill-dam, the design storm of spillway is 1.2times of probable rainfall with 100 years return period and design flood is determined by the rational method for the small catchment area. In general, the rainfall intensity within any concentrated time-period is derived by Talbot, Sherman and Kuno type whem long peridd's historical records are available. Otherwise, it is estimated by using the Mononobe formula from daily rainfall and the specific coefficient method for the concentration time of less than 1 hour. In this study, the specific coefficient method is examined on the 100 year's probable rainfall intensity for spillway design by using rainfall records in Taegu Meteorological station. In this specific coeeeicient method which was proposed by Ishiguro in Japan, all rainfall intensity curves are drawn by the multiplication of coefficient showing curves slope and 1 hour rainfall, and N-year's probable rainfall intensity formula is expressed as follows; In=βnㆍRn where In=N-year probable rainfall intensity in mm/hr:Rn=N-year probable1 hour rainfall in mm:βn=N-year probable shecific coefficient values. This βn values are obtained by the following equations which are equivalent to Talbot, Sherman and Kuno-type, and rainfall intensity formulas are derived only for 10 & 60 minutes. In the examination of this method, 100 years probable rainfall intensity is firstly obtained by using several methods in the computation of probability; (1) composite method in which the probability is estimate by Slade, Gumbel, Hazen and Gumbel-Chow methods, and the values of rainfall equivalent to empirical return period are chosen, (2) Slade method, (3) Gumbel-Chow method. Then the best fit type intensity formula is selected from the derivation of rainfall intensity by this chosen type's formula and specific coefficient method are carried out. The results obtained from this study are as follows; (1) Talbot type formula gives the best results among exact calculation rainfall intensity formulas. (2) The estimation of probable rainfall intensity by specific coefficient method is quite simpler than by exact calculation methods, and Case-Ⅰtype formula is fit well for the given historical data. (3) Therefore, it is believed that the derivation of probable rainfall intensity by the specific coefficient method is resonable in the spillway design of small reservoir for the concentration time of less than 1 hour.