Solute Variations in Small Catchment Streams: Some Comments

Dissolved material transport—the flushing effect in surface and subsurface flow

“…Data from recent higher frequency samples raises a question as to whether the simple model is suitable for explaining the solute transportation during storm events. The simple model cannot explain the flushing effect which has been mentioned in recent papers (Walling (1974(Walling ( , 1975; Walling and Foster (1975)). The flushing effect has to be ignored when using the simple model because this model is based on low frequency samples.…”

Progress in portraying the physical landscape

“…Ways have also been sought to gather data on, and wherever possible to monitor continuously, physical processes without the need for detailed, laborious or repetitive measurements, particularly in the fields of hydrology and meteorology. A recognition that such environmental monitoring can only represent a finite sample from the infinite population of spatial and temporal variations possible has encouraged thorough investigation of sampling procedures in such geographical work (Walling, 1975;Walling and Webb, 1975). Methods by which environmental data may be gathered by less skilled operators have also been sought, for example by soil surveys, to reduce the expense of data collection by highly trained scientists, and it has been shown (Beckett and Burrough, 1971) that grid survey is likely to give better value than free soil survey at map scales greater than i : 50 00o in most landscapes.…”

Book reviews: Bogardi, J. L. 1974: Sediment transport in alluvial streams. Budapest: Academiai Kiado. 826 pp. £21.00

“…This is particularly interesting, although most of the data are pre-1955, which prompts the nagging doubt that the weakness in the empirical analysis undertaken in part 3 may reflect the use of data collected before the advance had been made into automated data logging. As Walling (1975) has noted, frequent, if not continuous, sampling of sediment transport is necessary before meaningful models of the processes involved can be formulated and tested. Obvious criticisms of the book relate to the bibliography and index.…”