There is an increasing awareness of the role of mangrove forests in coastal ecosystems and coastal protection. At the transition between ocean and land, they have to absorb the energy that comes from the motion of the water. Little quantitative in formation is available, however, on wave transmission in these forests. In this paper the possibilities of the use of mathematical models to determine the influence of mangroves on waves are being explored. Both short and long waves have been examined. The results also been used to try to say something on phenomena encountered in nature .