Physicochemical and biological cycles in a tide dominated, nitrogen-polluted temperate estuary

Spatio-temporal variations in the physicochemical and biological parameters in the Morlaix estuary on the Brittany coast of France were studied. Hydrographically, the estuary can be classified into 3 segments: the upper estuary where stratification always persists, the lower estuary where vertical homogeneity is permanent, and a middle estuary where there is a regular oscillation of stratification and homogeneity during every tidal cycle, stratification being associated with slack waters and homogeneity, with ebb and flood. Nitrogen pollution in the estuary is very intense.

Activité de la station séismologique de Nhatrang durant la période Juin 1957-Décembre 1963

In June 1957, the Oceanographic Institute of Nhatrang agreed to support a seismological station whose equipment (3 CP components) was loaned by the National Centre for Scientific Research of France. Similarly, in order to develop its research activities, the Institute cooperated with the United States in their project for seismographs standardization. The author gives a detailed description of the new equipment (3 components and 3 C.P. L.P. components) received from U.S. and installed in June 1962.