Speed-driven projects require extensive planning and coordination for their successful execution within the specified time and cost. With an increasing demand for flash track execution, more efficient ways for project implementation is needed. Lean construction is having a profound impact on the construction industry, which is perceived to be suffering from cost and schedule overruns. This review paper investigates the use of various lean tools and principles in flash track projects and if there is any synergy between lean and flash track projects to improve productivity and schedule performance. Through rationalizations and with the help of case studies and theoretical evidence found in literature, eleven lean tools and eight lean principles have been analyzed for their synergy with flash track construction. The results indicate that all except one lean tool (Just in Time) and one lean principle (reduce inventory) facilitate successful implementation of flash track project.

A butterfly type of repeat track cruise was carried out in the South Eastern Arabian Sea (off Minicoy) onboard INS Sagardhwani during July 2016 to Aug 2016. We have also made use of the data from OMNI buoy, AD09, which is about 6 km close to the centre station of butterfly track. Air sea flux, the horizontal current data from AD09 and the time series data collected from the butterfly experiment were analysed to compute the mixed layer heat and salt budget. The short-term thermo-haline variability off Minicoy, relative contribution of heat/salt budget terms in MLD and its effects on acoustic propagation are addressed in this paper. In this study, most dominating term in the mixed layer heat budget estimation is net surface heat flux followed by the advective terms has been found. However the salinity in the mixed layer is dominated by the contribution of buoyancy mixing due to night time evaporative cooling. During the calm, sunny day, the so-called afternoon effect due to the diurnal heating restricts the sonar range. But during the windy day, the wind/wave mixing prevents the warming of the surface layer which in turn enhances the sonar range. Similarly, the night time cooling also enhance the acoustic propagation range. The presence of Arabian Sea High Salinity Watermass in the surface layer also enhances the acoustic propagation. rEFErEncES 1. Helber, R.W.; Barron, C.N.; Carnes, M.R. & Zingarelli, R.A. Evaluating the sonic layer depth relative to the mixed layer depth. variability of near-surface thermal structure and heat budget of the mixed layer of the tropical Indian Ocean from a new global ocean temperature climatology. 6. Prasad, T.g. A comparison of mixed-layer dynamics between the Arabian Sea and Bay of Bengal: Onedimensional model results.