Modeling Urban Growth
Objective: Develop realistic projections of land use changes in urban areas using a model that incorporates demographic inputs such as population and employment projections. These projections are very useful for investigations of future air quality, climate, water quality and transportation issues.
Figure 1. Current and projected land use for the 13-county metro Atlanta area. The current (2001) land use is from the National Land Cover Dataset (NLCD) in which shaded areas indicate developed land. Red and yellow areas in the projected land use images represent new development.
Figure 2. Current and projected land use for the Washington-Baltimore metro area. Shaded areas indicate developed land; red and yellow areas in the projected land use images represent new development.
Figure 3. Current and projected land use for the Orlando metro area. Shaded areas indicate developed land; red and yellow areas in the projected land use images represent new development.
We utilized the land use projections for the year 2030 for the Atlanta area in a mesoscale meteorological model to examine the effects of the changing urban landscape on near-surface air temperatures. In a pair of model simulations representing typical summer conditions, identical inputs were used except for land use, which was specified to represent current (2000) conditions in one simulation and future (2030) land use in the second simulation.
Figure 4. Near-surface (9 m) air temperature differences, based on land use changes from 2000 to 2030 for 3:00 PM LDT on the first day of the 8-day model simulation. Warming is seen from the 2000 conditions to the 2030 simulation, largest in the suburbs where development is greatest over this time period.
Figure 5. Average temperature differences between for 12:00 – 6:00 PM each day of the 8-day model simulation over the urban core and 5-county areas indicated in figure 4.
Mean near-surface air temperature changes, 2000-2030, for two daily time periods and two segments of the Atlanta metro area as indicated in figure 4.