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Development of A Single Reservoir Agricultural Drought Evaluation Model for Paddy
정하우,최진용,박기욱,배승종,장민원,Chung, Ha-Woo,Choi, Jin-Yong,Park, Ki-Wook,Bae, Seung-Jong,Jang, Min-Won The Korean Society of Agricultural Engineers 2004 한국농공학회논문집 Vol.46 No.3
This study aimed to develop an agricultural drought assessment methodology for irrigated paddy field districts from a single reservoir. Agricultural drought was defined as the reservoir storage shortage state that cannot satisfy water requirement from the paddy fields. The suggested model, SRADEMP (a Single Reservoir Agricultural Drought Evaluation Model for Paddy), was composed of 4 submodels: PWBM (Paddy Water Balance Model), RWBM (Reservoir Water Balance Model), FA (Frequency and probability Analysis model), and DCI (Drought Classification and Indexing model). Two indices, PDF (Paddy Drought Frequency) and PDI (Paddy Drought Index) were also introduced to classify agricultural drought severity Both values were divided into 4 steps, i.e. normal, moderate drought, severe drought, and extreme drought. Each step of PDI was ranged from +4.2 to -1.39, from -1.39 to -3.33, from -3.33 to -4.0 and less than -4.0, respectively. SRADEMP was applied to Jangheung reservoir irrigation district, and the results showed good relationships between simulated results and the observed data including historical drought records showing that SRADEMP explains better the drought conditions in irrigated paddy districts than PDSI.
농촌마을 개발계획 지원을 위한 토지 이용계획 모형( I ) - GIS, CA 및 MCE 법을 이용한 모형의 개발 -
정하우,최진용,김대식,Chung, Ha-Woo,Choi, Jin-Yong,Kim, Dae-Sik 한국농공학회 2002 韓國農工學會誌 : 전원과 자원 Vol.44 No.4
The purpose of this study is to develop a land use planning model (LUPM) which can be applied to development of rural villages considering their spatial expansion. The LUPM finds out and allocates the new built site required for the improvement of existing villages. in the development of LUPM, CA (cellular automata) and land suitability analysis methods were applied combinedly. The model uses basically numerical data of CIS based on grid data. Agglomerated settlement, as a type of village for simulation, was adopted. Probability of land use change for optimizing development area was calculated by the six criteria: slope. drainage characteristic, direction of slope, as absolute suitability of grid itself, distance from road. distance from stream and distance from the village center, as relative probability by neighborhood cells. Weighting values of these criteria were quantified by AHP (analytic hierarchy process) method, which is one of MCE(multi-criteria evaluation) method. The algorithm of the model was verified by three example villages: an isolation village, a village with horizontal road, and a village with nodal point of cross road
밭에서의 유효우량(有效雨量) 산정모형(算定模型) 개발(開發)
정하우 ( Chung Ha Woo ),김성준 ( Kim Seong Joon ) 한국농공학회 1993 韓國農工學會誌 : 전원과 자원 Vol.35 No.1
A model for estimating daily effective rainfall of upland crops was developed. The Infiltra-tion process was described by Green-Ampt infiltration model developed by Chu(1978). The model considers delayed surface ponding and surface detention storage under a uniform soil profile. The Green-Ampt parameters, that is, average hydraulic conductivity and average capillary pressure head on a sandy loam soil were determined from field experiment using Air-entry permeameter developed by Bouwer(1996). The model was verified by comparing measured and simulated surface runoff. The ratios of effective rainfall to total rainfall for red pepper, soybean, sesame and Chinese cabbage were evaluated using Borg`s root growth model(1986) respectively. The followings are a summary of this study results : 1 In a sandy loam soil, average hydraulic conductivity was 3.28cm/hr and average capillary pressure head was 3.00cm. 2. The root growth of upland crops could be expressed by Borg`s root growth model successively. 3. The measured and simulated surface runoff was agreed well with each other. 4. As the rainfall amount was increased, the ratio of effective rainfall to total rainfall was decreased exponentially till a certain growing period.
정하우 ( Chung Ha Woo ),이남호 ( Lee Nam Ho ),김성준 ( Kim Seong Joon ),최진용 ( Choi Jin Yong ),한형근 ( Han Hyung Geun ),김대식 ( Kim Dae Sik ) 한국농공학회 1994 韓國農工學會誌 : 전원과 자원 Vol.36 No.4
Floating-type automatic turnout was developed for the purpose of reducing labor cost and labor-working hours related to turnout management. The point of automation is to use a flexible-float within the turnout. The weight of float is changed by emptying and filling with water at the beginning and ending of irrigation. The turnout is controlled to open and close small hole on the float bottom using electromagnets. With the weight control of float, the gate of turnout is opened by the empty float to begin irrigatioin and is closed by the filled float to stop irrigation. The turnout was designed to be operated by the main computer and to minimize electric power consumption by sending an electric current at the beginning and ending of irrigation. The functional experiment was success-fully carried out and the rating curves for both free overflow condition and submerged flow condition were derived.
금강하구(錦江河口)둑 홍수예경보(洪水豫警報)시스템 개발(開發)(II) -시스템의 적용(適用)-
정하우 ( Chung Ha Woo ),이남호 ( Lee Nam Ho ),김현영 ( Kim Hyun Young ),김성준 ( Kim Seong Joon ) 한국농공학회 1994 韓國農工學會誌 : 전원과 자원 Vol.36 No.3
This paper is to validate the proposed models for the real-time forecasting for the Keum river estuary dam such as tidal-level forecasting model, one-dimensional unsteady flood routing model, and Kalman filter models. The tidal-level forecasting model was based on semi-range and phase lag of four tidal constituents. The dynamic wave routing model was based on an implicit finite difference solution of the complete one-dimensional St. Venant equations of unsteady flow. The Kalman filter model was composed of a processing equation and adaptive filtering algorithm. The processng equations are second order autoregressive model and autoregressive moving average model. Simulated results of the models were compared with field data and were reviewed.
농어촌(農漁村)의 용수계획(用水計劃)을 위한 저수지군(貯水池群) 물수지모형(收支模型)의 개발(開發)
정하우 ( Chung Ha Woo ),김성준 ( Kim Seong Joon ),한형근 ( Hang Hyung Geum ) 한국농공학회 1993 韓國農工學會誌 : 전원과 자원 Vol.35 No.4
The purpose of this study is to develop a multireservoir water balance model which may be used to evaluate rural water demands such as agricultural water industrial water and livestock water and determine effective storage of reservoir. The model was verified to compare the observed reservoir release data with the simulated reservoir release data of the existing Munsan and Dongbu reservoirs located in the Gisan rural district for 3 years(‘87~’89). For model application, the effective storages of existing reservoirs(Munsan & Dongbu) were evaluated for 10-year frequency drought and that of newly planned reser-voirs(Kumbok & Kudong) were determined for 10-year frequency drought. In addition, the behavior of effective storages for existing reservoirs were analyzed in the case of introducing new reservoirs in the existing system.
정하우 ( Chung Ha Woo ),이남호 ( Lee Nam Ho ),김성준 ( Kim Seong Joon ),최진용 ( Choi Jin Yong ),한형근 ( Han Hyung Geun ),김대식 ( Kim Dae Sik ) 한국농공학회 1994 韓國農工學會誌 : 전원과 자원 Vol.36 No.3
To improve the performance of irrigation management and practice during growing period of paddy rice with decreasing labor costs and with saving labor working hours, the integrated irrigation management system using microcomputer was developed. The irrigation management system was composed of four main subsystem : data acquisition subsystem, model subsystem, gate control subsystem and automatic intake devices. The model subsystem evaluates the data transmitted from field measuring stations and determine the necessity of irrigation. Also the user interface subsystem supported users to operate the system easily. The functional operation of the system was carried out and the applicability of the system was discussed.