Temporal Variations in Demand West Fixes East Fixes.

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Presentation transcript:

Temporal Variations in Demand West Fixes East Fixes

Flows at a Merge Point  Observed maximum of 3 significant flows at any merge point.  Implies number of flows to be merged is a limiting factor in complexity.  Example: Chicago, June 11, 2:12 p.m. ARTCC Boundaries Route Flown

Flows at a Merge Point  Generally observe 1 merge point only in a sector  Suggests performing merges is a limiting factor in complexity.  Example: Chicago, May 3, 8:59 p.m. Sector Boundaries In-bound ORD In-bound’s Route Flown Out-bound ORD

Arrival flows as part of larger system: Dallas  June 11, :29 p.m.163 Aircraft In-bound (DFW/DAL) DFW DAL OTHER (> FL240)

Summarizing so far….  Shown there exists similar branching structure in arrival flows.  Condensation points bring aircraft together to form flows  Flows are merged to provide final feed to an airports arrival fixes  Process reduces complexity of sequencing aircraft, and spreads that task across more controllers.  Examples of Elements Driving Complexity  Special Use Airspace (San Francisco)  Temporal variations in demand (arrival banks in Denver)  Limiting Factors for Complexity:  Maximum of 3 flows at a merge point  Only 1 merge points in a sector.

Weather, Flows, and Complexity  How does weather impact these flows?  Rerouting  Chicago, May 3  Holding  Boston, April 24  Dallas, May 4  Issues for Complexity:  Buffering  Ability to absorb aircraft should outflow be cutoff  Clustering  Result of competition between:  Efficiency gained by grouping aircraft.  Downstream limitations.  Sector Alignment to Flows

Impact of Convective Activity  Aircraft avoiding convective weather significantly distort flows.  May 11, 20017:52 p.m. (All Flights above FL280)

Chicago, May 3, 7:20 pm.  Thunderstorms about to impact NW fix.

Chicago, May 3, 8:59 pm.  To deal with complexity associated with increased demand, diverted aircraft are integrated into existing patterns for NE fix.  Example: Chicago, May 3, 8:59 p.m. High Sector Boundaries In-bound ORD In-bound’s Route Flown Out-bound ORD

Illustrating the Concept of Buffering: Holding in Boston  Being forced to hold aircraft causes the buffering capacity to decrease, increasing the complexity for the controllers.  April 24, 20016:33 p.m.70 Aircraft In-bound