Sand dunes are vulnerable to erosion by both wind and water, but primarily by wind, since its attacks against the dunes are sustained for substantial and frequently recurring periods of time, whereas, if protected by typical berms, beaches and underwater slopes, the dunes are attacked by water only at infrequent intervals. The best available means of protecting said dunes against wind erosion is by preventing indiscriminate trespassing, construction or other acts oceanward of the development restriction line which might destroy or damage said dunes and through the use of native plantings, supplemented by sand fencing and other devices designated to prevent the free blowing of sand and the maintenance of the surface tensions, root accumulations, normal contours and other features found in typical natural dunes.