Surfing wave generation

A wave generating system for use in a wave pool defining a body of water having a water surface and a shoreline, the wave generating system comprising:

• a plunger (22) having movable portions for adjusting a side cross section profile of the plunger;
• a drive mechanism (100) for causing the plunger (22) to oscillate along a path intersecting with the water surface, wherein oscillation of the plunger (22) along the path generates waves in the wave pool;
• and
• a reef unit (260) located in the body of water between the plunger (22) and the shoreline, the reef unit (260) including a plurality of legs (262) and a member (264) supported by the plurality of legs (262), the member (264) having a wave break surface (266) under the water surface for generating wave breaks (267) as the waves propagate over the wave break surface (266), wherein the plurality of legs (262) are adjustable in length for adjustably positioning the wave break surface (266) at various depths under the water surface;
• wherein the wave generating system is controllable by adjusting the side cross section profile of the plunger to generate waves having different amounts of energy;
• wherein the wave generating system is controllable by adjusting the depth of the wave break surface under the water surface to cause the waves to break at a desired location in the wave pool;
• wherein the side cross section profile of the plunger (22) is adjustable during oscillation of the plunger (22) along the path;
• and
• wherein the side cross section profile of the plunger (22) is adjustable to a relatively larger side cross section profile for immersing the plunger (22) into the body of water and is adjustable to a relatively smaller side cross section profile for raising the plunger (22) relative to the body of water.