The pilot was departing from a tidal beach in a tailwheel-equipped airplane. During the takeoff roll, the pilot stated that he lost visual reference through the windscreen because the sun was in his eyes, and he allowed the right wingtip to contact some alder brush, which forced the airplane to ground loop. The airplane sustained substantial damage to both wings, and the left horizontal stabilizer. The pilot indicated that there were no preaccident mechanical anomalies with the airplane that would have precluded normal operation.