. Design of riprap revetments for protection against wave attack. Shore protection; Water waves. DESIGN OF RIPRAP REVETMENTS FOR PROTECTION AGAINST WAVE ATTACK by John P. Ahrens I. INTRODUCTION Quarrystone is the most commonly used material for protecting earth embank- ments from wave attack because, where high-quality stone is available, it pro- vides a stable and unusually durable revetment armor material at relatively low cost. This report provides information and specific guidance on the design of stone riprap revetments, including several examples to illustrate the concepts presented. It
. Design of riprap revetments for protection against wave attack. Shore protection; Water waves. DESIGN OF RIPRAP REVETMENTS FOR PROTECTION AGAINST WAVE ATTACK by John P. Ahrens I. INTRODUCTION Quarrystone is the most commonly used material for protecting earth embank- ments from wave attack because, where high-quality stone is available, it pro- vides a stable and unusually durable revetment armor material at relatively low cost. This report provides information and specific guidance on the design of stone riprap revetments, including several examples to illustrate the concepts presented. It supplements Sections and of the Shore Protection Manual (SPM) ( Army, Corps of Engineers, Coastal Engineering Research Center, 1977). II. RIPRAP DESIGN CONSIDERATIONS The discussion in this section draws heavily on laboratory studies of rip- rap stability. Currently, there is little well-documented information avail- able on the field performance of riprap. In the design of a riprap revetment, a careful evaluation of the performance of riprap or other revetments near the design site or at similar sites is an important adjunct to the guidance given in this report. Information on the design of armor and filter layers, zero- damage and reserve stabilities of the armor layer, selection of overlay armor to upgrade existing revetments, and wave runup is given in this section. Two design aspects which are particularly difficult to study in the laboratory in- clude the toe design of a riprap revetment and tying the ends of the revetment into a nonreveted embankment. Consequently, these aspects are not discussed in this report since little information is available on them. A definition sketch for some terms used in this section is shown in Figure \_j^-Continuation of Structure Slope Filter Loyer, -Armor Loyer of Riprop r. J Design Water Level- \^ZZZ?Zz&yJl!l shore Slope Angle Structure Face Makes with Horizontol Figure 1. Definition sketch. 'MVMW////,. Please note that
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