S. Saptomo - Academia.edu (original) (raw)
Papers by S. Saptomo
Discharge of flow under sluice gate at tertiary intake is quite sensitive to fluctuation of upstr... more Discharge of flow under sluice gate at tertiary intake is quite sensitive to fluctuation of upstream water level so that gate opening should be adjusted frequently. This could be easily done using automatic mechanism of sluice gate that controlled by simple fuzzy logic algorithm. In this paper, simulation was done to evaluate this algorithm in controlling constant discharge at tertiary intake. Simulations was done for 3 types of scenario i.e. (1) at free flow under high upstream water level, (2) at free flow under low upstream water level, (3) at transition from free to submerged flow. These simulation resulted Delivery Performance Ratio (DPR) at acceptable range if the simple fuzzy logic algorithm was used. When sluice gate operated at constant opening, mean DPR of each scenario are 0,96, 0,86 and 0,82. Better results were observed when simple fuzzy algorithm was used, mean DPR are 1,00 for each scenario.
The aim of this research is to develop an automation system for irrigation to be implemented on e... more The aim of this research is to develop an automation system for irrigation to be implemented on existing irrigation facility. A fuzzy timer control (FTC) technique was developed for application in water level control. FTC is the modification of the original fuzzy logic control (FLC) which have been widely known and been applied in various control systems. The FTC was applied in simulation using water balance analysis of weather, evapotranspiration and land condition information. Simulation was conducted for dry season and rainy season, using weather data input as disturbance to the system. The set point was chosen based on the water level in the irrigation practice used in SRI cultivation. FTC showed good performance in the anticipation of water level fluctuation to maintain water level near the setpoint, but faced difficulty in heavy rainfall event especially in heavy rain season. During dry season, the FTC showed better performance and ability to maintain water level near the desired level. The simulation was conducted using spreadsheet programmed with macro basic language. The simulation also gave the irrigation and drainage capacity of 1.3 lt/sec.ha for rainy season and1.6 lt/sec.ha for dry season, with each performance index of 11871.5 and 4225.4, which values are the results of optimization during the simulation.
Paddy and Water Environment, 2009
Insufficient puddling with inappropriate implements or imprecise time/intensity may alter saturat... more Insufficient puddling with inappropriate implements or imprecise time/intensity may alter saturated water flow in paddy soil spatially or temporary due to change in aggregate size distribution, dry bulk density, saturated hydraulic conductivity, and percolation rate of the soil. In this study, spatial variability of saturated hydraulic conductivity (K s ), a key parameter of the saturated water flow, in Fuchu Honmachi paddy plot (100 m 9 28 m) was characterized based on dielectric or ADR dry bulk density (q b-ADR ) with help of non-similar media concept (NSMC) and geostatistics model to meet its correlation to subsurface percolation. A 100 cc core and an ADR data were sampled from each sub-plot (7 m 9 7.5 m), and then were used for measuring and predicting q b and K s . The predicted data agreed with the measured ones, in which they fitted well the x = y line with RMSE of 0.029 cm 3 cm -3 (R 2 = 0.68), 0.027 g cm -3 (R 2 = 0.71) (q b ), and 0.098 cm d -1 (R 2 = 0.45) for h, q b , and K s , respectively. The predicted q b and K s had similar trend in spatial variability to the measured ones particularly within the distance of 46.3-51.9 m and 26.2-27.9 m, respectively. The spatial variability of the predicted K s coincided to that of the subsurface percolation rate, in which they had similar distance of dependence. The results indicated that the presenting method can be reasonably accepted.
As respond to demand on reducing water for agricultural sector as the water usage competition is ... more As respond to demand on reducing water for agricultural sector as the water usage competition is increasing between various sectors, water efficient irrigation techniques were offer in order to keep the water status at the desirable level at a production land, while avoiding loss of water and within a certain amount of water available. Automation system was applied to micro irrigation system following wireless control network concept for multiple outdoor plots with different types of irrigation system. Control system is applied for tickle, sprinkle, pitcher and disk irrigation. The automated irrigation system is proven to work and keep water status accordingly to the desired condition which is field capacity, between pF 2.54 and 4.2. As the soil moisture was kept within the range percolation can be suppressed to its minimum or even halt. The system can be improved and used for various conditions of production lands and irrigation infrastructure.
Discharge of flow under sluice gate at tertiary intake is quite sensitive to fluctuation of upstr... more Discharge of flow under sluice gate at tertiary intake is quite sensitive to fluctuation of upstream water level so that gate opening should be adjusted frequently. This could be easily done using automatic mechanism of sluice gate that controlled by simple fuzzy logic algorithm. In this paper, simulation was done to evaluate this algorithm in controlling constant discharge at tertiary intake. Simulations was done for 3 types of scenario i.e. (1) at free flow under high upstream water level, (2) at free flow under low upstream water level, (3) at transition from free to submerged flow. These simulation resulted Delivery Performance Ratio (DPR) at acceptable range if the simple fuzzy logic algorithm was used. When sluice gate operated at constant opening, mean DPR of each scenario are 0,96, 0,86 and 0,82. Better results were observed when simple fuzzy algorithm was used, mean DPR are 1,00 for each scenario.
The aim of this research is to develop an automation system for irrigation to be implemented on e... more The aim of this research is to develop an automation system for irrigation to be implemented on existing irrigation facility. A fuzzy timer control (FTC) technique was developed for application in water level control. FTC is the modification of the original fuzzy logic control (FLC) which have been widely known and been applied in various control systems. The FTC was applied in simulation using water balance analysis of weather, evapotranspiration and land condition information. Simulation was conducted for dry season and rainy season, using weather data input as disturbance to the system. The set point was chosen based on the water level in the irrigation practice used in SRI cultivation. FTC showed good performance in the anticipation of water level fluctuation to maintain water level near the setpoint, but faced difficulty in heavy rainfall event especially in heavy rain season. During dry season, the FTC showed better performance and ability to maintain water level near the desired level. The simulation was conducted using spreadsheet programmed with macro basic language. The simulation also gave the irrigation and drainage capacity of 1.3 lt/sec.ha for rainy season and1.6 lt/sec.ha for dry season, with each performance index of 11871.5 and 4225.4, which values are the results of optimization during the simulation.
Paddy and Water Environment, 2009
Insufficient puddling with inappropriate implements or imprecise time/intensity may alter saturat... more Insufficient puddling with inappropriate implements or imprecise time/intensity may alter saturated water flow in paddy soil spatially or temporary due to change in aggregate size distribution, dry bulk density, saturated hydraulic conductivity, and percolation rate of the soil. In this study, spatial variability of saturated hydraulic conductivity (K s ), a key parameter of the saturated water flow, in Fuchu Honmachi paddy plot (100 m 9 28 m) was characterized based on dielectric or ADR dry bulk density (q b-ADR ) with help of non-similar media concept (NSMC) and geostatistics model to meet its correlation to subsurface percolation. A 100 cc core and an ADR data were sampled from each sub-plot (7 m 9 7.5 m), and then were used for measuring and predicting q b and K s . The predicted data agreed with the measured ones, in which they fitted well the x = y line with RMSE of 0.029 cm 3 cm -3 (R 2 = 0.68), 0.027 g cm -3 (R 2 = 0.71) (q b ), and 0.098 cm d -1 (R 2 = 0.45) for h, q b , and K s , respectively. The predicted q b and K s had similar trend in spatial variability to the measured ones particularly within the distance of 46.3-51.9 m and 26.2-27.9 m, respectively. The spatial variability of the predicted K s coincided to that of the subsurface percolation rate, in which they had similar distance of dependence. The results indicated that the presenting method can be reasonably accepted.
As respond to demand on reducing water for agricultural sector as the water usage competition is ... more As respond to demand on reducing water for agricultural sector as the water usage competition is increasing between various sectors, water efficient irrigation techniques were offer in order to keep the water status at the desirable level at a production land, while avoiding loss of water and within a certain amount of water available. Automation system was applied to micro irrigation system following wireless control network concept for multiple outdoor plots with different types of irrigation system. Control system is applied for tickle, sprinkle, pitcher and disk irrigation. The automated irrigation system is proven to work and keep water status accordingly to the desired condition which is field capacity, between pF 2.54 and 4.2. As the soil moisture was kept within the range percolation can be suppressed to its minimum or even halt. The system can be improved and used for various conditions of production lands and irrigation infrastructure.