Analysis of hydrodynamic (flow) and thermal patterns in Kranji reservoir

• Main Author: Ng, Guo Hong.
• Other Authors: Lo Yat-Man, Edmond
• Format: Final Year Project
• Language: English
• Published: 2013
• Subjects: DRNTU::Engineering
• Online Access: http://hdl.handle.net/10356/53378
• Institution: Nanyang Technological University

In this study, DYnamic REServoir Simulation Model (DYRESM), a one-dimensional model was calibrated to allow the prediction of vertical distribution of temperature. The simulation was done using data collected on site from Kranji Reservoir over a period of 253 days, from 21 September 2011 to 30 May 2012. The thermal structure and variability in Kranji reservoir, which were affected by the North East Monsoon, were explored. Lower air temperature and higher frequency of strong winds were measured during that period. These conditions destabilized the water column and encouraged mixing, and resulted in more days with lower surface temperature. The meteorological characteristics of days that produce the maximum and minimum vertical thermal stratification (ΔT) were investigated. With a better understanding of the environmental system and relationships, the DYRESM model was first run using a 2 months preliminary calibration data obtained from an earlier study in 2007 on Kranji reservoir. It was found that the mixing capability of the model was overestimated. Further analysis was done in this FYP to find the dominant parameter. To calibrate a better model, trial and error simulations on the parameter were done. This study showed that with proper calibration, it is possible to come up with a model that gives good approximation under most meteorological conditions.