A co-worker of mine lives on a residential lake here in Southern Louisiana. From what he tells me (and from what I can see from his photos) it looks like a pretty standard wooden bulkhead that he has maintained to the best of his ability over the years. Where his yard meets the bulkhead has been eroding/undermining for years and he tried to fix the problem by replacing the dirt. Now all of the new dirt is starting to erode/undermine just as before. His yard gradually slopes towards the lake, but as it gets close to the bulkhead the slope increases significantly. I have attached a photo to help show what is going on (he is in the process of replacing the top running boards, that why there is a gap).
He would like to resolve this problem, but is trying to avoid a major rebuild. Any ideas on how to address this? You help is greatly appreciated.