ABSTRACT
This chapter describes a mathematical model CLEAN, a computer code name for the Comprehensive Lake Ecosystem Analyzer. The model was claimed useful both as a tool for ecosystem research and as an evaluation methodology for environmental management of a lake. The chapter explains the model methodology, spatial representation, adaptation problems of a general model, data problems of a new application, and sensitivity analysis. There are many ways to specify the spatial representation of aquatic ecosystems. The simplest representation of a lake is to consider it as a completely mixed tank. In some lakes where there are in-lake water quality data, there is no waste input or nutrient load information. A preliminary computation has demonstrated its applicability to Lake Erie with a three reactor representation. Based on Canale's concept, it is proposed that Lake Erie be represented by a grid system.
