본 논문은 호안용 매트리스내 채움재의 한계_허용 전단응력을 제시하였다. 먼저, 매트리스가 설치된 수로에서 유수력이 작용할 때 각 지점에 대한 유효전단응력을 산정하였다. 다음으로, 입자들의 한계운동을 결정하는데 주로 사용되는 Shields 계수와 전단응력을 이용한 채움재의 평균입경을 산정하였다. 마지막으로, 산정된 각 인자들을 근거로 철망내 개별 암석의 안정조건을 만족시키는 한계_허용 전단응력의 범위를 결정하였다. 또한 매트리스와 사석의 비교를 통해 매트

Revetment Mattress/Filter is the porous structure filled fillers in meshed structure so that it can use the fillers of various sizes and form various pores. The porous structure of the Mattress/Filter increases drainage so that it decreases the energy and velocity of flow therefore the tractive force is decreased and the erosion of revetment is mitigated. The filler of Mattress/Filter uses gravels, waste concretes and slags so that the surface is rough and the roughness coefficient increases and the increase of the roughness coefficient decreases flow velocity and tractive force. On the other hand Mattress/Filter and vegetation are combined so that the increase of roughness coefficient and flow velocity still more progress therefore the effect of decrease of tractive force is increased after a few months have passed since the Mattress/Filter is constructed so that the vegetation is developed and be stabilized. The vegetation channel of Mattress/Filter is set up and the inspection comes into operation by varing flowrate and vegetation spacing to examine these characters of the Mattress/Filter. The coefficent of flow velocity U/U*' is decreased exponentially as vegetation desity aH' or λ is increased and the coefficient of friction f is increased as vegetation desity aH' is increased but decreased as the coefficent of flow velocity U/U*' is increased. The effective tractive force F0 is decreased exponentially as the vegetation desity aH' is increased. From the inspection the results are obtained that the porous and vegetation structure of the revetment Mattress/Filter system increases the coefficient of friction of revetment so that flow velocity and effective are decreased therefore greatly contributes the stability of the revetment.

Aquatic plants grow in water with photosynthesis and purify water quality as taking organic and inorganic matter in water. Polluted water in stagnant stream channel where nutritive salts load is great can be purified by activities of aquatic plants. Aquatic plants should be fixed to bed easily to plant and sustainable environment is needed. So in this study, Mattress/Filter system is suggested to plant aquatic plant in stagnant stream channel. In the result of study, coverage of Phragmites australis, Zizania latifolia and Typha angustifolia which planted in mattress was 78%, 62% and 82% and numbers of species in each mattress system were 7, 11, 3. The evenness index of each mattress system was 0.86, 0.91 and 0.79 and diversity index of each mattress system was 1.67, 2.18 and 0.87. Removal rates of phosphorus at Phragmites australis, Zizania latifolia and Typha angustifolia which planted in mattress were 68.7%, 62.7%, 55.3% and removal rates of nitrogen of them were 79.8%, 74.7%, 64.9%. The removal rate of nitrogen was greater than phosphorus at all system and both removal rates were greater at Phragmites australis than at Zizania latifolia and at Typha angustifolia the rate was the least. Removal rates of PO4-3, NH4-N, NO3-N at Phragmites australis were 57.4%, 52.8%, 47.8% and at Zizania latifolia were 82.6%, 77.2%, 67.5% and at Typha angustifolia were 80.6%, 73.7%, 64.3%. It seems that removal effect is great by the planted mattress system.

water quality analysis of rainwater collected from catchment equipment(2m×1m) was conducted to determine its suitability for domestic purposes, in this study. As the results of analysis, the pH of rainwater was 6.3±0.3, and the turbidity of rainwater was over the 5 times than drinking water guidelines. For the usage of rainwater as the domestic and drinking water, the rainwater is need to treat. The analysis value of BOD was about 3 mg/L and the values of heavy metal as the Pb, Cd, Fe, Mn, Cr6+ and Cu was satisfied with drinking guidelines. Overall results of analysis support the possibility of rainwater as the domestic and drinking water.

In general, the evaluation of water supply capacity is important factor to establish various establishment of water resource supply plan include water resource security and determination of dam's mass. But former researchs about estimation of water supply capacity were lack in continunity of evaluation basis, and didn't excute analysis on reliability criteria also. In this study, Nakdong river was selected for study basin, and then water supply capacity was analyzed by HEC-5 model using identical reliability criteria.

본 연구의 목적은 홍수유출해석을 위한 확정론적 유출모형의 개발에 있으며, 유출과정은 비 선형으로 취급하여 단순화시킨 개념적 모형을 유역유출모형으로 제시하였다. 개념적 모형의 구조는 지표유출을 일으키는 지표면과 지표하유출을 일으키는 토양층으로 구분하고 이들 각 구조를 지표와 지표하로 나누어 유출과정을 개념화하였으며, 지표흐름의 지체효과는 부탱크를 도입하여 나타내었다. 지표하 구조에서 중간 및 지표하 흐름의 성분들은 수치 filter를 이용하여 분리하였다.

하상보호용 사석은 초기 거동조건의 범위를 넘어 한계조건에 도달하면 흐름에 의해서 각각의 자갈 또는 석재가 분리되면서 점진적으로 파괴된다. 이와 반대로 하상보호용 매트리스의 경우는 비록 초기 거동조건의 범위를 넘어 한계조건에 도달할지라도 매트리스 철망에 의해 각각의 자갈 또는 석재의 분리가 억제가 됨을 알 수 있었다. 비록 변형된 하상보호용 매트리스일지라도 새로운 형태의 평형을 얻을 수 있으며, 더 이상의 변형과 나쁜 조건에서도 저항할 수 있음을 확인하였

본 연구는 우수를 생활용수로 활용하고 있는 도서지역의 재래적인 우수이용방법을 개선하고 안정적으로 생활용수를 공급할 수 있는 우수이용 시스템을 개발하는데 연구의 목적이 있다. 이를 위하여 연구의 대상지역으로는 제주도 지역을 선정하고 실제 강우 및 생활용수의 관계를 run이론을 이용하여 규명하고 그 결과는 우수이용 시스템의 집수면적과 탱크크기를 설계하는 기법을 제시하였다. 실제에 적용해 본 결과, 설계된 우수이용 시스템이 제주도지역에서 안정적으로 운영이 되

In this study, the Dilution Method is used to measure river discharge through the hydraulic model test. the dilution method is divided into Constant-Rate-Injection Method and Slug-Injection Method in the river discharge measurement techniques. When the dilution method is applied in the hydraulic model flume, it is analyzied that the estimated error of constant-rate-injection method is less than that of the slug-injection method, and the result shows that floodflow analysis is more efficient than lowflow analysis as compared observed discharge with calculated discharge. The result of statistical error analysis shows that the constant-rate-injection method is appropriate technique for the measurement of the river discharge. Therefore, the dilution method among the river discharge measurement techniques can be applied for the river basin which can`t be measured with current meter or unsteady-flow regime in the urban-small drainage or hydraulic structure equipment area and can be obtained more exact results than any other discharge measurement techniques.