• 한국농공학회:학술대회논문집
• /
• 한국농공학회 2002년도 학술발표회 발표논문집
• /
• pp.9-12
• /
• 2002

The purpose of this study was to investigate the effects of ponding depth treatment on evapotranspiration in paddy fields. Three poding depth treatments, very sallow, shallow, and deep were used. The experimental plots were three $80m{\times}8m$ rectangular plots. Daily values of rainfall amount, ponding depth, irrigation water, drainage water, evapotranspiration, and infiltration were measured in the field. The ponding depth was continuously observed by observed nstaff during the growing season. The ET was measured by 1m diameter PVC lysimeters. Irrigation water volume was measured by 75 mm pipe flow-meters and the drainage water volume by 75 mm pipe flow-meters and a recording parshall flume. The results showed that irrigation water depths were 688.9 mm, 513.6 mm, and 624.4 mm in 2001, and 356.9 mm, 428.6 mm, and 513.2 mm in 2002 in very shallow, shallow, and deep ponding, respectively. The evapotranspiration were 465.0 mm, 484.1 mm, and 415.1 mm in 2001 and 461.3 mm, 476.3 mm, and 470.6 mm in 2002 in very shallow, shallow, and deep ponding, respectively.

• 한국안전학회지
• /
• 제33권4호
• /
• pp.119-126
• /
• 2018

In recent years, as flood damage caused by heavy rains increased, the great-depth tunnel using urban underground space is emerging as a countermeasure of urban inundation. The great-depth tunnel is used to reduce urban inundation by using the underground space. The drainage efficiency of great-depth tunnel depends on the intake design, which leads to increase discharge into the underground space. The spiral intake and the tangential intake are commonly used for the inlet facility. The spiral intake creates a vortex flow along the drop shaft and reduces an energy of the flow by the wall friction. In the tangential intake, flow simply falls down into the drop shaft, and the design is simple to construct compared to the spiral intake. In the case of the spiral intake, the water level at the drop shaft entrance is risen due to the chocking induced by the flowrate increase. The drainage efficiency of the tangential intake decreases because the flow is not sufficiently accelerated under low flow conditions. Therefore, to compensate disadvantages of the previously suggested intake design, the multi-stage intake was developed which can stably withdraw water even under a low flow rate below the design flow rate. The hydraulic characteristics in the multi-stage intake were analyzed by changing the flow rate to compare the drainage performance according to the intake design. From the measurements, the drainage efficiency was improved in both the low and high flow rate conditions when the multi-stage inlet was employed.

• 한국지리정보학회지
• /
• 제17권4호
• /
• pp.40-51
• /
• 2014

본 연구의 목적은 건물의 유무에 따른 도시지역의 침수특성을 이중배수체계기반의 2차원 침수 해석모형을 이용하여 각각 해석하고 해석 결과의 차이를 비교하는데 있다. 이를 위해 LiDAR 측량 기반 $1m{\times}1m$ 해상도의 표고모델과 표고모델 위에 건물의 외벽을 따라 지표수 유입을 억제하는 격자를 생성한 표고모델의 2가지 지형자료를 구축하였고, 2가지 지형조건을 2차원 침수해석모형의 입력 자료로 활용하기 위해 $10m{\times}10m$ 해상도로 re-sampling 하였다. 분석 결과, CCTV 영상에 의한 실측 침수심 자료와 모의값을 비교한 결과, 건물을 고려하지 않은 지형자료를 사용한 경우 침수심이 과소 산출되었으나, 건물을 고려한 경우에는 실측값과 근사하게 모의되었다. 침수심의 차이는 침수 가능 면적의 변화에 따라 침수체적이 변하게 되므로, 지표면으로 유출되는 수문량이 절대량으로 고정된다면 침수 가능영역이 큰 지형자료를 사용한 경우 침수심이 낮아지기 때문인 것으로 판단된다. 한편 침수흔적도와 비교한 침수면적은 두 지형자료 모두 큰 차이를 보이지 않았으나 근사하게 건물을 고려한 경우의 일치도가 높은 것으로 나타났다. 따라서 침수면적과 침수심의 두 가지를 종합적으로 고려한다면, 이중배수체계기반의 2차원 침수해석모형을 활용하여 도시유역의 침수해석을 수행하는 경우, 건물을 고려한 지형자료를 사용하는 것이 바람직하다고 판단된다.

• 한국물환경학회지
• /
• 제23권5호
• /
• pp.748-755
• /
• 2007

To develop an efficient pump operating rule for a retard basin, it is necessary to estimate inflow to the retard basin accurately which is affected by the backwater effect at the outlet of the conduit. The magnitude of the backwater effect is dependent on the water depth of a retard basin; however, the depth is determined by the amount of inflow and outflow. Thus, a real time simulation system that is able to simulate urban runoff and the pump operation with the consideration of the backwater effect is required to estimate the actual inflow to a retard basin. With this system, the efficient pump operating rule can be developed to diminish the possible flood damage on urban areas. In this study, a realtime simulation system is developed using the SWMM 5.0 DLL and Visual Basic 6.0 equipped with EXCEL to estimate inflow considering the backwater effect. The realtime simulation can be done by updating realtime input data such as minutely observed rainfall and the depth of a retard basin. Using those updated input data, the model estimates actual inflow, the amount of outflow discharged by pumps and gates, the depth of each junction, and flow rate at a sewer pipe on realtime basis. The developed model was applied to the Joonggok retard basin and demonstrated that it can be used to design a sewer system and to estimate actual inflow through the inlet sewer to reduce the inundation risk. As results, we find that the model can contribute to establish better operating practices for the pumps and the flood drainage system.

• 한국농공학회:학술대회논문집
• /
• 한국농공학회 2005년도 학술발표논문집
• /
• pp.313-317
• /
• 2005

This study aimed to estimate applicability of a model to simulate circulation in estuarine lake caused by operation of drainage gates. The model consists of 2D (depth-averaged) hydrodynamic models, Delft3D-FLOW model and operation model for drainage gates. The flow through drainage gates was calculated using weir formulae with discharge coefficient, 0.8. The simulations are performed under two conditions: uncontrolled condition and controlled by periods of two days. The results on simulation of the model showed that the water level in estuarine lake was tend to increase above mean sea level. Therefore it was proved that the calibration and verification were needed in order to applicate this model for Saemankeum area.

• 한국조경학회지
• /
• 제23권2호
• /
• pp.195-204
• /
• 1995

This study is focused on the groping for the alternative ways in order to prevent the various bad factors caused by the Inferior environment on the planted trees. In the reclaimed paddy field which is planned to make a housing site, for example, we are trying to catch the problem about the special feature of the unharmonized drainage. And the survey gives the suitable way of planting trees. This survey was carried out in the three different area and could notice some phenomena : There are a few different conditions for water supply int\ulcorner the soil according to the height of the land-filling from the original ground and the slope of the planting area. And the imporant factor of the drainage effect is not the soil texture itself but the depth of the filling land. As a result of this survey, the study shows the economic alternative for reducing the demage of the planting trees which is due to drainage system.

• 한국초지조사료학회지
• /
• 제39권2호
• /
• pp.81-88
• /
• 2019

본 연구는 사일리지용 수수${\times}$수단그라스 교잡종을 파종 한 후 배수로 깊이를 0 cm, 20 cm, 40 cm 그리고 60 cm로 처리하고 이에 따른 생육특성, 수량성 및 영양적 특성을 비교 검토하였다. 초장, 엽장 및 엽수는 처리구에 따라 유의적인 차이가 나타나지 않았지만, 엽폭은 배수로 깊이가 깊을수록 유의적으로 커지는 것으로 나타났다(p<0.05). 그리고 하고엽 발생 수는 60cm > 0cm > 40cm > 20cm구 순으로, 녹색도는 20cm > 40cm > 0cm > 60cm 구 순으로 높게 나타났다(p<0.05). 경의 굵기와 경도는 배수로 깊이가 깊을수록 유의적으로 높아지는 것으로 나타났다(p<0.05). 생초수량, 건물수량 및 TDN 수량에서도 배수로 깊이가 깊을수록 유의적으로 높은 수량성을 나타냈다(p<0.05). 조단백질 및 TDN 함량은 40cm구가 가장 높게 나타났다(p<0.05). 조회분 함량은 20cm > 40cm >0cm > 60cm 순으로 높게 나타났다(p<0.05). ADF 및 NDF 함량은 0cm 처리구에서 높게 나타났다 (p<0.05). 총 무기물 함량은 20cm > 0cm > 40cm > 60cm구 순으로, 유리당(fructose, glucose and sucrose) 함량은 0cm > 20cm > 40cm > 60cm구 순으로 높게 나타났다(p<0.05). 구성아미노산 함량은 20 cm구가 가장 높게 60cm구가 가장 낮게 나타났다(p<0.05). 이상의 결과를 종합해 볼 때, 처리구에 따라 성분(조단백질, TDN, 무기물, 유리당 및 구성아미노산) 함량은 차이가 있지만, 건물 수량 및 TDN 수량을 고려한다면 저지대 논 토양에서 수수${\times}$수단그라스 교잡종 재배는 배수로 깊이를 60cm 정도로 하는 것이 유리하다.

• 한국농공학회지
• /
• 제39권2호
• /
• pp.134-142
• /
• 1997

This study was performed to evaluate the drain runoff characteristics from one paddy field, and to provide the basic data required for the determination of flood discharge and unit drainage water for drainage improvement and farmland consolidation. For this purpose, under the assumption that drain discharge from paddy field was similar to outflow of reservoir, runoff model based on storage equation was applied to the experimental field, and simulated results were compared to the measured discharge at weir point. To estimate effective storage volume of paddy field with water depth, 4 regression formula were examined such as linear, exponential, power, and combined. From the observed runoff characteristics, it was shown to be 3.3~16.3${\ell}$/sec in weir discharge, 57.2~98% in runoff ratio, and relative error of simulated result was 3.0~39.4%, 8.5 ~56.0 % for peak flow and runoff ratio, respectively. Curve number by SCS method was calculated as mean value of 96.4 using measured rainfall and runoff data, it was considered relatively high because paddy field has generally flooding depth contrary to the upland watershed area.

• 한국작물학회지
• /
• 제40권5호
• /
• pp.574-579
• /
• 1995

건답직파 재배시 중간낙수처리가 도복에 미치는 영향을 구명하고자 1991년에 동률벼를 공시, 5월 1일에 휴립 세조파하고, 파종후 30일에 심수하고 심수후 20일 부터 10일 간격으로 1∼3회 낙수처리하여 도복관련형질 및 수량을 검토한 결과를 요약하면 다음과 같다. 1. 간장 및 절간장은 낙수회수가 많을수록 짧아지고 간벽은 두꺼워졌으나, 줄기 굵기는 상시심수에서 다소 굵었다. 2. 낙수회수가 많을수록 중심고는 낮아지고 좌절중은 무거워서 도복지수는 적어졌으며, 낙수회수가 많을수록 뿌리량이 많아지고 뿌리의 심층분포비율이 높아지는 경향이었다. 3. 도복은 상시심수에서는 심하게 발생되었으나 낙수회수가 많을수록 경감되어 2∼3회 낙수처리에서는 도복이 발생되지 않았거나 경징하였다. 4. 수량은 등숙후기(출수후 35일)에 도복이 발생되어 상시심수와 낙수처리간에 차이가 없었으나, 현미중의 청미비율은 낙수회수가 많을수록 감소되는 경향되었다. 5. 따라서 건답직파 재배시 심수후 20일부터 10일간격으로 2∼3회 중간낙수 처리하는 것이 도복방지를 위한 적절한 물관리 방법이라고 생각된다.

• 한국관개배수논문집
• /
• 제14권2호
• /
• pp.225-235
• /
• 2007

The shape of streamflow hydrograph during the early period of spring is very much controlled by the area and depth of snow cover especially in mountainous area. When we simulate the streamfolw of a watershed snowmelt, we need some information for snow cover extent and depth distribution as parameters and input data in the hydrological models. The purpose of this study is to suggest an extraction method of snow cover area and snow depth distribution using Terra MODIS image. Snow cover extent for South Korea was extracted for the period of December 2000 and April 2006. For the snow cover area, the snow depth was interpolated using the snow depth data from 69 meteorological observation stations. With these data, it is necessary to run a hydrological model considering the snow-related data and compare the simulated streamflow with the observed data and check the applicability for the snowmelt simulation.