Scientists in the environmental domains (biology, geographical information, etc.) need to capitalize, distribute and validate their experimentations of varying complexities. The concept of the scientific workflow is increasingly being considered to fulfill this requirement. This article presents the first phase of the establishment of a workflow environment corresponding to the static part, i.e., a meta-model and a language dedicated to the design of process-chain models. We illustrate our proposal with a simple example from the spatial domain and conclude with perspectives that open up with the establishment of a workflow environment.