I am born in Tulcea and I have traveled to sulina on a regular basis, during summer time.
I must say that place fascinates me. First of all, the only way I could help you is to try to access the local archives.
When I will be in Sulina this summer (end of June-early July) I will certainly do so. I expect some communication problems during that time, since there was no Internet Caffe in Sulina last time I was there.