An application of the automatic domain updating to the Tonle Sap Lake, Cambodia

• Published in: Hydrological Research Letters Vol. 14; no. 2; pp. 68 - 74
• Main Authors: Yoshioka, Hidekazu, Tanaka, Tomohiro
• Format: Journal Article
• Language: English
• Published: Tokyo Japan Society of Hydrology and Water Resources (JSHWR) / Japanese Association of Groundwater Hydrology (JAGH) / Japanese Association of Hydrological Sciences (JAHS) / Japanese Society of Physical Hydrology (JSPH) 2020; Japan Science and Technology Agency
• Subjects: Automatic control; Computer applications; Computer simulation; Domains; Errors; Evapotranspiration; Flood control; Flooded areas; Floods; Flow simulation; Lakes; Rainy season; Rivers; Simulation; Tropical climate; Tropical lakes; Two dimensional flow; Wet season; Cambodia
• ISSN: 1882-3416; 1882-3416
• DOI: 10.3178/hrl.14.68

Simulating flow dynamics in large-scale lakes is often time-consuming. For river flood simulation, the automatic domain updating (ADU), which can effectively control the simulation domain only in and around the flooded areas, has recently been developed. It is easily implementable without any computational errors for river flood simulation; however, its applicability to lake flow simulation with precipitation/evapotranspiration has not been investigated. This study examines the applicability of the ADU to large-scale lake flow simulation with the 2-dimensional local inertial equations (2D-LIE) taking the Tonle Sap Lake, Cambodia, as a study site. The 2D-LIE with the ADU demonstrated 2.1 times faster simulation with errors less than 5.5%. This efficiency was achieved owing to the wet/dry seasonal nature of the tropical lake and backflow from the mainstream of the Mekong River in the rainy season, suggesting that the ADU is applicable to large-scale lake flow simulation.