|dc.contributor.author||Laffan, Michael D.||
|dc.description.abstract||The primary aim of this research is to study in detail
the soil pattern and erosion characteristics of a small
representative catchment in the Wither Hills, and to determine
the interrelationship between soil properties, both field and
laboratory, on the initiation of tunnel erosion and its
sequential development into open gullying.
The basic steps of this approach to the problem of tunnel-gully
erosion are briefly outlined as follows. 1. A survey of the soils of the representative catchment in order to delimit the problem. It was noticed from cursory
examination of the Wither Hills that tunnel-gully erosion was
not prevalent over every section of the landscape. The lower
spurs and ridges seemed to be relatively free of tunnel gullies,
although minor ones were apparent in isolated localities. The
main ridges and higher slopes of the hills were definitely devoid
of this erosion form although scars of former slips were evident. 2. A detailed study of a toposequence on those soils
where the tunnel-gully problem was most acute. This involved
intensive field and laboratory determinations in an effort to
relate pedological, chemical and physical properties to the incidence and severity of erosion.
In addition this detailed study was used to characterise these soils as typical of the dry-subhygrous,
central yellow grey earth subgroup, on the basis of their
morphology, chemistry, mineralogy and physical properties.
3. To fully describe the process of tunnel-gully formation as it occurs in the field.
4. To compare the tunnel-gullied soils of the Wither Hills
(a) soils from other regions showing similar erosion forms,
(b) with soils in similar environments but not liable to tunnel-gully erosion.
It was thought that such a comparison using morphological
properties and selected laboratory determinations would help
explain the susceptibility of some soils to tunnel-gullying
and also the actual process of tunnel formation.
Considerable time was devoted to the soil survey to
gain as much information as possible on the geomorphology and
pedology of the representative catchment so as to relate slope
development and soil formation which were seen to be interdependent. Hence, an attempt to understand the genesis of these soils is an essential part of the work as not all yellow
grey earths have exactly the same pedogenic history.
The ultimate aim of the whole study was to elucidate
the tunnel-gully erosion pathway on the Wither Hills, and to
provide such data that practical methods could eventually be
devised to control existing tunnel-gullies.||en
|dc.publisher||Lincoln College, University of Canterbury||en
|dc.title||The soils and tunnel-gully erosion of a small catchment in the Wither Hills, Blenheim||en
|thesis.degree.grantor||University of Canterbury||en
|thesis.degree.name||Master of Agricultural Science||en
|lu.thesis.supervisor||Cutler, E. J. B||
|lu.contributor.unit||Department of Soil and Physical Sciences||en
|dc.subject.anzsrc||050302 Land Capability and Soil Degradation||en
|dc.subject.anzsrc||040607 Surface Processes||en
|dc.subject.anzsrc||0503 Soil Sciences||en