Thermal characteristics of two regulated rivers in mid‐wales, U.K.

Abstract

Abstract Data for three rivers in the upper Severn catchment are examined to assess the influence of regulation strategies on the thermal characteristics. Seasonal and diel temperature variations are markedly influence by the release discharge and the depth of withdrawal from the reservoir. The downstream influence of river regulation is confined to a relatively short reach ( ca . 30 km) below the dams. Nevertheless, the control of water temperature during hot, dry summers could benefit salmon populations.