Generation of a marshland environment using GH

Dear all,

I stumbled upon a challenge of finding a swift way of modelling a marshland environment (fig. Marsh 3).

What I am trying to achieve is to model curvilinear shapes gently sloping up to the center a meter above the construction plane (the marshes overgrown with plants) and lower the space in between gently sloping down few meters below construction plane (bottom of the marsh under water).

I was thinking of using Kangaroo SpringsFromLine and Kangaroo Physics to make this work, however, this technique relies on triangulated meshes (I cannot find a way of turning one of those shapes into a mesh to start with) which moves away from smooth marshes I would like to model (figs. Marsh 2-3). Could anyone please help out with 'know how' on how to do this? So far I relied on physical modelling.

Your help would be much appreciated,

Wayne