Page - 1036 - in Book of Full Papers - Symposium Hydro Engineering

core has vanished. The jet then consists of blobs of water that disintegrate into finer drops. It is considered no more “developing” but “developed”. The decision is made on the parameter Lb/H with H being the jet falling height. Fig. 3 Pre-excavated plunge pool model together with installed pressure sensors Second, when the jet – developed or not – plunges into the pool it forms a new core of a thickness Bj, no longer solid this time. This core is gradually reduced by turbulent mixing with the surrounding water. After a distance of 4 Bj the core is dissipated. In case the ratio Y/Bj – Y being the pool depth – is larger than 4, the pool is considered “deep”, otherwise “shallow”. Fig. 4 Impingement jet analysis according to Castillo [4] 1036