A tutorial modelling approach to explain the reflexes in the system dynamics of the Batticaloa Lagoon in response to discharge from irrigation tanks

Abstract

Any effort to managing the Batticaloa lagoon well should begin with understanding its dynamics as a key contributor to flood mitigation and control. Of particular concern in these regards are the inputs from major and minor irrigation tanks (that are connected to the lagoon) that disturb the natural stability of the Batticaloa Lagoon. Understanding the interconnected mechanics of the tanks and the lagoon could be enhanced by the exploration of the processes through conceptual/mathematical simulation models. In this respect, a tutorial simulation model: TIL 1.0 was developed using in the STELLA9 v7.03-modelling platform to imitate the interconnectivities between and irrigation tanks and Batticaloa Lagoon. The Model TIL 1.0 presents an easy to way to simulate different processes of the problem of concern and generate various outputs such as water raise in lagoon, water levels, excess water in lagoon, salinity drop, chance offloading, and Bar-Mouth condition/'s. The unique aspect of the TIL 1.0 is that it is less technical savvy, and, provides the opportunity to non-scientists (i.e. administrators and bureaucrats) to understand the lagoon system in a logical manner and consequently take sustainable decisions in managing the said system.