I took my tipi for a family rafting trip one year on the main Salmon River. We camped at the best spots (i.e. sandbars). Every afternoon on that trip we had about an hour of 30+ mph winds and thunderstorms. I didn't have really long stakes, but I am not sure how well long stakes would have done since 9-12 inches under the sand was streambed rock often. Maybe a snow-type stake would have worked? Bottom line is that we had to cut paracord to attach to every tipi stake spot in order to bury rocks and logs as "sand anchors". It worked, but what a pain. I almost only use a floorless tent/tarp...except, when camping on sandbars on the river, I bring a self supporting type dome tent. With the dome tent you can just fill the tent with gear and a couple of rocks, and maybe bury a sand anchor at the downriver corner where the afternoon storms/wind will be coming from. This is easy and your tent won't blow away. Also you will have better vetilation and won't have sand blowing through your tipi...although blowing sand can prevented by covering all of the tipi edges with sand.
