Site Report
Terrain Variables
Slope
| 5 |
| 12.5 |
| 20 |
| 27.5 |
| 35 |
| 20 |
| 27.5 |
| 35 |
| 27 |
| 30 |
| 33 |
| 36 |
Slope (percentage steepness) highlights the maximum rate of change from a cell to its neighbors, indicating the steepness of terrain. Although steeper slopes are more difficult to manage, these slopes produce some of the best wines in the world. Slope is important in all aspects of farming, determines row direction for adequate drainage, mechanization and labour intensity.
Elevation:
| 5 |
| 12.5 |
| 20 |
| 27.5 |
| 35 |
| 20 |
| 27.5 |
| 35 |
| 27 |
| 30 |
| 33 |
| 36 |
Elevation (altitude) is the elevation above mean sea level. Air temperature generally decreases with an increase in elevation at a mean lapse rate of approximately 0.65 per 100 m increase in altitude. The coolest localities during the nights are at the bottom of south facing slopes where cultivars that needs cold temperatures for good colour development needs to be planted.
Aspect:
| 5 |
| 12.5 |
| 20 |
| 27.5 |
| 35 |
| 20 |
| 27.5 |
| 35 |
| 27 |
| 30 |
| 33 |
| 36 |
Aspect is the direction in which a slope faces. Aspect has a big influence on solar interception and exposure to prevailing winds. South facing slopes are cooler than north facing slopes in the southern hemisphere at the same altitude. East facing slopes are exposed to the morning sun and west facing slopes are exposed to afternoon sun.
Topographic Wetness Index:
| 5 |
| 12.5 |
| 20 |
| 27.5 |
| 35 |
| 20 |
| 27.5 |
| 35 |
| 27 |
| 30 |
| 33 |
| 36 |
Topographic (or Terrain) Wetness Index (TWI), quantifies topographic controls of basic hydrological processes displayed as a dimensionless linear color gradient, with starting and ending point colors based on the minimum and maximum flowpath intensities unique to each catchment. TWI is one the most important factors that indicates the potential of runoff generation. High values of TWI means the high potential of runoff generation and vice versa.
Huglin Index (2016/17):
| 5 |
| 12.5 |
| 20 |
| 27.5 |
| 35 |
| 20 |
| 27.5 |
| 35 |
| 27 |
| 30 |
| 33 |
| 36 |
Growing Degree Days (2016/17):
| 5 |
| 12.5 |
| 20 |
| 27.5 |
| 35 |
| 20 |
| 27.5 |
| 35 |
| 27 |
| 30 |
| 33 |
| 36 |
Growing degree days (GDD) are calculated for each day on a basis of daily average temperature and base temperature set to 10?C for grapevines. Daily seasonal summations from 1 September to 31 March. Higher GDD for the season is expected to advance grapevine phenological stages. This was adapted from the Winkler index (Amerine & Winkler, 1944) by Le Roux (1974)
Biologically Effective Degree-Day Index (2016/17):
| 5 |
| 12.5 |
| 20 |
| 27.5 |
| 35 |
| 20 |
| 27.5 |
| 35 |
| 27 |
| 30 |
| 33 |
| 36 |
Growing Season Average Temperature (2016/17):
| 5 |
| 12.5 |
| 20 |
| 27.5 |
| 35 |
| 20 |
| 27.5 |
| 35 |
| 27 |
| 30 |
| 33 |
| 36 |
Climatic Variables:
Daily mean temperature for September to December:
