Geology Reference
In-Depth Information
map were digitised as polygons in the MAP module. This digitised map
automatically generated grid pattern for use in the MODFLOW.
The gird pattern was developed by assigning a constant spacing 400 ×
600 m. This spacing resulted in dividing the area into 40 rows and 30
columns (Fig. 2). A part of the area was discretised into a relatively finer
mesh size as they comprised numerous pumping wells. Vertically this region
was divided into a single layer of varying thickness. The Bay of Bengal,
Muttukadu Estuary and the Adyar River were taken as constant head
boundaries as the water levels in these water bodies are generally at mean
sea level throughout the year. The Buckingham Canal was taken as internal
constant head boundary with the constant head at mean sea level. The western
boundary of the area was considered as a no flow boundary as shown in
Fig. 2.
Figure 2.
Model grid pattern and boundary conditions.
