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하천제방의 비정상침투해석을 위한 무차원 설계홍수파형에 관한 연구
전세진,권경준,안원식,Jeon. Se-Jin,Kwon. Kyung-Jun,Ahn. Won-Sik 한국방재학회 2009 한국방재학회논문집 Vol.9 No.4
제방을 설계하거나 기존제방을 보강하기 위해서는 침투해석이 필요하다. 미국, 유럽 등과 같이 대규모하천이 대부분인 외국에서는 댐에서와 같이 정상침투해석을 하고 있으나 우리나라와 일본하천의 경우는 홍수지속시간이 짧아 설계홍수파형을 정상상태로 해석할 경우에는 과대한 외력을 주게되므로 시간에 따른 수위변화를 고려한 비정상 침투해석을 하여야한다. 이 경우 하천수위와 지속시간에 대한 홍수파형이 필요하나 국내에서는 명확한 기준이나 지침이 없다. 본 연구에서는 비정상침투해석에 사용되는 설계홍수파형을 유도하였다. 수위자료가 양호한 낙동강 수계 진동 등 5개 수위관측지점의 과거 주요홍수에 대해 지속시간별 홍수위를 조사하여 무차원화를 시켰다. 그리고 통계적.확률적 처리를 통하여 무차원 설계홍수파형을 작성하였다. 작성된 홍수파형의 적정성은 과거 발생한 원홍수사상과 금회 유도한 설계홍수파형을 이용하여 침투해석을 시행하고 일본의 방법과 비교해서 적정성을 분석하였다. 동수경사법과 한계유속법에서 오차는 각각 진동 <TEX>$0{\sim}0.7%,\;0{\sim}0.7%$</TEX>, 현풍 <TEX>$1.6{\sim}4.0%$</TEX>, <TEX>$1.7{\sim}4.1%$</TEX>, 왜관 <TEX>$0.6{\sim}3.6%$</TEX>, <TEX>$0.6{\sim}3.7%$</TEX>, 낙동 <TEX>$2.0{\sim}8.1%$</TEX>, <TEX>$2.0{\sim}8.1%$</TEX>, 정암 <TEX>$1.2{\sim}9.8%$</TEX>, <TEX>$1.3{\sim}9.9%$</TEX>로 나타났다. 상관성(<TEX>$R^2$</TEX>)은 <TEX>$0.983{\sim}0.999$</TEX> 정도로 매우 상관성이 높게 나타났으며, 일본의 방법보다 합리적이며, 실무에 적용이 가능한 것으로 판단된다. The seepage should be analyzed to design or reinforce the levees. The steady seepage analysis is an usual application in USA and European countries where the large scaled dams and levees are existed. However, Korea and Japan, where the reaching time is short, the excessive forces are applied on the levees at the short reaching time if the seepages are analyzed in steady condition. Accordingly, the unsteady analysis based on the variation of time is necessitated. In the unsteady analysis, the flood wave type is necessary. No criteria and standards, however, are derived for the unsteady seepage in Korea. In the study, the flood wave type is derived for the unsteady seepage. The major reliable flood surface data are collected in 5 stations including Jindong of the Nakdong river basin. The data are sorted in duration, and they are non-dimensionalized. The statistical method is also applied to derive the waves. To verify the study, the seepage is analyzed by the derived wave and applied to the prototype. The results are also compared with the Japanese Method. The errors between the hydraulic gradient and critical velocity method are <TEX>$0{\sim}0.7%$</TEX>, <TEX>$0{\sim}0.7%$</TEX> at the Jindong, <TEX>$1.6{\sim}4.0%$</TEX>, <TEX>$1.7{\sim}4.1%$</TEX> at the Hyunpoong, <TEX>$0.6{\sim}3.6%$</TEX>, <TEX>$0.6{\sim}3.7%$</TEX> at the Waegwan, <TEX>$2.0{\sim}8.1%$</TEX>, <TEX>$2.0{\sim}8.1%$</TEX> at the Nakdong, and <TEX>$1.2{\sim}9.8%$</TEX>, <TEX>$1.3{\sim}9.9%$</TEX> at the Jeongam, respectively. The relationship(<TEX>$R^2$</TEX>) between each method is relatively high as <TEX>$0.983{\sim}0.999$</TEX>. This means the results are more logical than the Japanese method, and the study is applicable to the design of hydraulic structures.
침출수 처리를 위한 펜턴 산화법의 효율적 적용 방안에 관한 연구
전세진 ( Se-jin Jun ) 한국고등직업교육학회 2002 한국고등직업교육학회논문집 Vol.3 No.4
This study was performed to effectively apply Fenton oxidation process for the treatment of leachate. The experiments showed that the ratio of removed-COD/hydrogen peroxide was higher in 2nd treated water than rawwater, therefore we can conclude that the application of Fenton oxidation after biological treatment of leachate is a more effective treatment method than treating rawwater directly. The coagulant used recycled iron sludge that had been redissolved with sulfuric acid for the experiments of coagulation. The results showed that the COD removal rate was almost the same as that of a new coagulant. Therefore, it could be proposed that the new treatment process of leachate by Fenton oxidation following coagulation with recycled sludge is more efficient than conventional Fenton oxidation only. Compared to conventional Fenton oxidation, it is expected that we can reduce chemical expenses by 50 % with the new treatment process while obtaining the same water quality.