Investigation on the wave-current intercation in Laguna de Bay

• Main Authors: Alcaraz, Francis M., Climaco, Michael B., Ho, Kennedy T., Reyes, Kevin M.
• Format: text
• Language: English
• Published: Animo Repository 2017
• Subjects: Floods > Philippines > Laguna De Bay; Flood control > Philippines > Laguna De Bay
• Online Access: https://animorepository.dlsu.edu.ph/etd_bachelors/7725
• Institution: De La Salle University

Flooding has been a frequent problem in the Philippines, and this has led to several problems such as property damage, inaccessibility to certain areas, and even death. One solution is to control and maintain bodies of water that can contribute to the problem of water, in this case, Laguna de Bay, is performed. Laguna de Bay is the largest lake in the Philippines. It is a multi-purpose lake wherein over 100 rivers and streams drain into the lake. Over the years, the construction of the Manggahan floodway and Napindan channel are two flood control structures that were created in order to divert the flow from Marikina River to Laguna de Bay and prevent water from entering Pasig river, respectively. With all of this take into account, the investigation on the interaction between the waves and currents found within the lake was performed. A study conducted by Herrera et. al (2014) showed that there were different situations in terms of the water level and current during both the dry season and wet season. Simulated values from DELFT3D-flow and DELFT3D-wave yielded values close to measured data from a monitoring station established. The aim of the paper was to quantitatively describe the waves and currents during both normal and extreme conditions, in this case, during the dry and wet season, to identify areas that are susceptible to flooding. Secondary data gathered by the researchers from agencies such as LLDA, NAMRIA and PAGASA, were the following: inflow from the twenty-four tributaries of the lake, lake level, outflow from the Napindan channel, a topographic map of the area, representative rain, typhoon, and wind data. Due to lack of measured data, evaporation was assumed. Upon the completion of secondary data gathered, a numerical based model known as DELF3D was used to simulate the wave-current interaction of the lake. The year 2013 was chosen since this is where a large amount of inflow from the tributaries was seen. It was seen that from the months of January to May, there were minimal waves, a decrease in t