Suchergebnisse

Precast concrete blocks can be used as erosion protection to a surface subjected to high‐velocity water, for example a dam spillway.The paper describes model testing carried out on flat and wedge‐shaped blocks in a purpose‐designed facility at the University of Salford, where an open channel discharge intensity of 0.5 m2/s can be accelerated to a velocity of 7.5 m/s.The failure modes of tied and untied flat concrete blocks have been investigated under different laying and bedding conditions. The model results are compared to the findings from prototype studies. Results from experiments on wedge‐shaped blocks of a Soviet design are also presented and confirm the Russian experience that the wedge shape is inherently stable at large discharges, a block of 100‐m thickness being stable under a discharge intensity of 20 m2/s.

Discusses the safety aspects, the economic case and the environmental consequences of the Sizewell B nuclear power station recorded in the Layfield Report. (AM)

Commissions or committees are appropriate for issues of general policy and public inquiries for particular, usually local, disputes where specific rights and interests are involved. Both confront the expertise of particular professions and by various methods overcome the difficulties of interpretation for lay people. These difficulties are not fundamentally different whether the subjects concern technology or the natural sciences on the one hand or the social sciences on the other. (PFB)