| 1
Contact person |
|
1.1
Name |
Dr.
S.A. Lorentz |
|
1.2
Address |
Dept.
of Agricultural Engineering, University of Nepal, Box XO1, Scottsville,
3209, South Africa. |
|
1.3
Tel |
+27
331 260 5701 |
|
1.4
Fax |
+27
331 260 5818 |
|
1.5
Email |
lorentz@aqua.ccwr.ac.sa |
|
1.6
Other researchers involved: |
|
|
| 2
Survey Details |
|
2.1
Dates of erosion monitoring survey: |
1990
- present |
|
2.1
Water/wind erosion? |
Water |
|
2.3
Area monitored: |
1.
Sugar cane fields on sensitive soils ± 5km2 1+2 ha
main catchments. 2. Forestry/Grassland erosion plot studies.
Kwazula/Natal. 3. Regional Erosion estimation: Mgeri Basin ±
400 km2 + intensive sub-catchment studies : 170 km2. |
|
2.4
Character of area: |
1.
Sugar cane - subcatchment monitoring. 2. S/tropical savannah
and cultivated pine forests. 3. S/tropical savannah, farm land,
sugar cane plantations and cultivated forests. |
|
2.5
Frequency of monitoring: |
1.
Approximately 3 per year. 2. Continuously, weekly plot data.
3. One-off study - continuing. |
|
2.6
What fraction of fields in the monitored area were included
in the survey? |
1.
10%. 2. 80%. 3. 100%. |
|
2.7
How were estimates of erosion made? |
1.
RUSLE + main-catchment sediment yield (1995). 2. RUSLE + plot
yield. 3. RUSLE |
|
2.8
Were air photographs used? |
1.
Ground photographs. 2. No. 3. Yes + ground photography. |
|
2.9
For each erosion site, information recorded: |
Photographic
data of cover. Up to 1995 and continuing. Soils texture and
physical and hydraulic properties. Small catchment sediment
yield. Met. data. Full station autographic. Starting 1995. 2.
Plot data, runoff, yield. Soil moisture, physical and hydraulic
properties. Met. data. Full station. Autographic. 3. Air photo
interpretation of cover. Soil survey information. Met. data.
Daily. Subcatachment : sediment yield events : Autographic raw
measurement. |
|
|
2.10
Data obtained from elsewhere: |
|
|
2.11
Data calculated from above information: |
1.
RUSLE parameters; sediment yield mass kinetic E of rain. 2.
RUSLE parameters; erosion mass, K-E of rainfall. 3. RUSLE parameters.
Subcatachment sediment yield, K-E of rainfall. Runoff. |
|
2.12
Meterological station density and type: |
1.
1 full met. station of 3 mini catchments 1-2 ha. ± 5 km apart.
2. 1 full met station on site. 3. Daily rainfall and met stations
± 1/50 km2. |
|
2.13
Length of record of meterological data: |
1.
Start 1995. 2. Start 1988 - present. 3. 10-50 years rainfall. |
|
| 3.
Associated Work |
|
3.1
Associated experimental or plot-based work: |
1.
Lab. analysis of soils, physical and hydraulic small catchments
monitoring 1-2 ha. 2. RUSLE plots in grassland. Cultivating
forestry with different prep. 3. Subcatchment sediment yield
monitoring |
|
3.2
Associated modelling work: |
1.
ACRU sediment yield and
RUSLE. 2. RUSLE. 3. ACRU sediment yield + RUSLE. |
|
| 4.
Documentation |
|
4.1
Published reports of the monitoring survey and/or results: |
|
| Design
documentation only.
Reports
to the South African Water Research Commission.
Kienzle
and Lorentz. 1995. Simulating the Hydrology and Water Quality
of the Mgeri catchment. Report to the South African Water
Research Commission.
|
|
|
4.2
Other relevant publications: |
|
| Kienzle
and Lorentz. 1993. Production of a Soil Erodibility Map for
the Henley Dam Catchment, Natal. Using a GIS approach. In: Lorentz
et al. 6th South African National Hydrology Symposium
XII Proceedings.
Howe and
Lorentz. 1995. Sediment Yield Modelling in the Henley catchment.
South African Agricultural Engineering Journal. (In press).
|
|
| 5.
Availability |
|
5.1
Erosion/land use data: |
Available
with costs of extraction. |
|
5.2
Meterological data: |
Available
with costs of extraction. |
| 6.
Other Information |
|
6.1
Is the monitoring survey ongoing? |
Yes. |
|
6.2
Funding agency for the survey: |
1.
South African Department of Agriculture. 2. South African Water
Research Commission. 3. South African Water Research Commission. |
|
6.3
Any other details: |
|
