- The paper presents data for regular and random wave interaction with a single, flexible cylinder. The model cylinder was designed to exhibit dynamic characteristics of a TLP riser or tendon in approximately 1000 m of water. Experiments were conducted in the deep water wave basin at the Offshore Technology Research Center (OTRC), Texas A&M University. The model was instrumented to provide detailed information on the cylinder response. The cylinder response was analyzed to provide some physical insight into the complex wave-flexible cylinder interaction phenomenon. The transverse response was analyzed as a function of Keulegan-Carpenter number to allow comparison with previous studies in oscillating flow. The complicated multi-frequency response for large Keulegan-Carpenter numbers is explained by introducing the depth dependence of the Keulegan-Carpenter number, resulting in a multi-frequency, wave-induced transverse loading. Variation in response as a function of depth is also presented for various wave conditions. A relationship between transverse response and high frequency content of the inline response is illustrated for both regular and random waves.