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Landing capacity of a dual threshold runway
| 题名： | Landing capacity of a dual threshold runway |
| 作者： | RJ.D. Verbeek |
| 关键词： | Dual threshold, displaced threshold, aircraft landings, runway capacity. |
| 摘要： | The noise boundaries imposed by the Dutch government on Schiphol Amsterdam airport make it necessary to use special noise abatement procedures to accommodate the growing air traffic. These procedures are studied within the Technological Operational Measures Schiphol (TOMS). Unfortunately, a positive effect on noise expected from these measures does not mean a positive effect on the capacity of the airport. It is necessary to analyze this issue also. The purpose of this report is to examine the effect on the landing capacity of a dual threshold runway. This is a procedure where, due to the usage of an elevated final approach path above the primary path, the separations between the aircraft can be reduced. A positive effect on capacity can be obtained in this way. Also a smaller noise footprint is expected, because of the heightened route. To analyze the effect on capacity the dual threshold runway is investigated theoretically. Also it is implemented into the "airport and airspace simulator" SIMMOD to test some scenarios quantitatively. The distance needed between the two thresholds to conduct safe landings depends mainly on the wake vortex turbulence generated by the trailing aircraft and the location accuracy of both aircraft of both aircraft. Scenarios are tested for various instrument landing systems based on ILC, MLS and GPS giving a large variation in the safe distances needed. The separation times needed between the elevated and the primary track and vice versa are dependent on the runway occupation time, the decision height and the threshold displacement distance. Having these separations fixed on a theoretical basis the mean delays and ultimate capacity can be determined. A model in the simulator SIMMOD is created, incorporating the threshold displacement and the separation times. Having obtained this model, comparisons to the single threshold runway are made and different ratios of aircraft are looked at. There are two main conclusions. First of all, the displacement distance is at a critical length, being at the edge of what is practical. And even this is only feasible with the right air space structure and a sufficiently accurate instrument landing system. Second, the increases in capacity which can be gained are in the order of five percent in comparison to a single threshold runway. |
| 报告类型： | 科技报告 |
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