Surveying on Glaciers

Seasonal waves on glaciers

Seasonal waves accompanying annual changes in the sliding velocity of ice travel down glacier at speeds much faster than the ice itself. A simple explanation for these waves in terms of the passage of a pressure wave through the subglacial drainage system is given. Drainage by both distributed and localized systems is explored, with the sliding velocity governed by a dependence on the effective...

Waves on glaciers

This paper is an attempt a t a mathematical synopsis of the theory of wave motions on glaciers. These comprise surface waves (analogous to water waves) and seasonal waves (more like compression waves). Surface waves have been often treated and are well understood, but seasonal waves, while observed, do not seem to have attracted any theoretical explanation. Additionally, the spectacular phenome...

New thinking on water flow through glaciers

Surveying adolescents: Focusing on positive development.

Although risk behaviours can threaten healthy youth development, reducing risks alone is not sufficient to help youth successfully negotiate adolescence. Promoting protective factors that buffer risk, such as family and school connectedness, community engagement and positive peer support, are also important for helping youth to thrive. Since 1992, the Adolescent Health Surveys conducted by McCr...

Beri-Beri on the Surveying Ships

In the administration report of the Marine Survey of India for the official year 1894-95, I reported the occurrence of an outbreak of beriberi on the R. I. M. S. Investigator and Nancowry, and described the measures found successful in combating the epidemic. In the present state of our knowledge of the cause of disease an account of the outbreak, fuller than that given in this official report,...