Role of Supply Chains Unit 1: Defining the Freight System.

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Presentation transcript:

Role of Supply Chains Unit 1: Defining the Freight System

What is a Supply Chain All stages involved, directly or indirectly, in fulfilling a customer request Includes manufacturers, suppliers, transporters, warehouses, retailers, and customers

Why do we care about supply chains? Supply chains represent the decision making entities in goods movement Their collective decision making creates the activity of the freight transportation system To understand how things might change with changing conditions, we need to understand their logic

What is the parallel in passenger transportation? What is the decision making unit? What do we do to try to understand their logic? What tools do we use to estimate their behavior?

How does REI get goods to market? Asian Factories West Coast Port Distribution Center Destination Store Container on marine vessel Drayage truck Short or Long-haul truck

How do we observe the effects of changing supply chains? Warehouse sizes

Warehousing Location Quotients by State 1998 and 2006 (Source: U.S. Census County Business Patterns)

Other trends Larger container vessels – Expansion of Panama Canal 4 corners import strategy – Use of multiple distribution centers Mode shifting

Challenges Obtaining information – How do we know what moves around, when it moves, and where it goes?

Freight Traffic Data Truck – Fixed location counts (WIM stations) Rail – Waybill sample restricted access Air – Flight data available from FAA – Very limited commodity data Water – Army Corps substantial volume data General lack of knowledge about what is IN the vehicles

Commodity Flow Data Commodity Flow Survey (BTS) – Freight Analysis Framework Import and Export control at ports and borders – Value – Weight Vehicle counts must be estimated – Typically misses intermediate locations

Potential solutions Case Studies – Very difficult to build up the system from individual firms or commodities Required data submission – Mile taxes in Ontario and Oregon Refining commodity flow data at a regional level

Example of Investigating Current Supply Chain Issues Estimating Freight Flows in WA State: Case studies in data-poor and data-rich environments Work by: Anne Goodchild, Derik Andreoli, Eric Jessup, and Sunny Rose

Research Problem Freight supports regional economies Desire to justify investments targeting freight Evaluate the impacts of network changes – Vulnerability to disruptions – Improvements and infrastructure needs – quantify the value of improvements Limited by available data

State of Freight Modeling Currently two primary modeling sources: – Commodity flow data – Gross vehicle volumes – Assume industries use infrastructure in the same way Existing methods are too coarse for needed analysis – Commodity flow data spatially aggregate – Vehicle estimates are categorically aggregate Basic problem in freight modeling – Lack of quality disaggregate commodity flow data

Project Scope Improve the representation of freight movement in statewide modeling Work within existing data constraints Develop and implement a methodology to estimate industry- specific, corridor-level truck trips Study Washington State due to the frequent disruptions to key freight corridors – I-5 (flooding) – I-90 (avalanche) Snoqualmie Pass closed ~370 hours in winter season Snow Affects I-90 (and 2 & 12); Highway 410 and Highway 20 are closed seasonally every winter Longest closures are 3-5 days long No way to turn around

Washington State Topography Map courtesy of geology.com SEATTLE SPOKANE YAKIMA VANCOUVER

Washington State Infrastructure SEATTLE SPOKANE YAKIMA VANCOUVER Only 3 ways across the Cascades Cascade passes significantly limit east-west travel In the winter, only 3 routes cross the cascades: I-90, Highway 2, and State Route 12 ALL are very prone to avalanche danger and have frequent closings of varying lengths Which helps more: information on closures or solutions to improve reliability

Focus on Two Sample Data Sources Estimate statewide truck trips required for the operation of industries within Washington State Data-rich industry: potato distribution Idealized case Information about production, processing, demand, distribution, capacity ratios Data-poor industry: diesel distribution Realistic case Use estimated origins & destinations How to model flows? Photo courtesy of WSDOT

Details to be discussed in a later lecture…

With this info we can model the routes shipments take, and how they would divert in the case of a closure Many trucks are diverted in the case of a cross-Cascades disruption, resulting in a near doubling of trip lengths

Potato Industry Flows: Summary Significant cross-Cascades travel Low profit margins on potato shipments Cannot afford to take detours Waiting or failure to stock products are expensive Very vulnerable to long closures

Mapping diesel flows terminal racks truck pipeline barge Long distance movements by barges and in pipelines – because of the large volumes and high cost of movement Diesel is moved from terminal distribution points by truck to local points of sale. Modeling the truck movements of diesel as cargo – the green arrows moving away from the red dot terminal locations

Diesel Terminal Service Areas Terminals are the origins in the model – locations known Racks/ cardlocks (points of sale of diesel to consumers) are the destinations – Examining not all, but a majority of these facilities – Locations known Do not KNOW which terminals serve which racks but we can make assumptions

SEATTLE SPOKANE YAKIMA VANCOUVER Diesel Network Flow-Map: Pre-Disruption Assume racks are served by the closest terminal – can identify shortest path – reasonable since the product quality is relatively consistent & costs are directly tied to traveled distance Link widths represent the number of OD pairs that would use a link – not weighted by volume, not enough information – useful on a strategic level: some routes heavily used, other pieces of infrastructure do not matter

Diesel Network Flow-Map Adding a cross-Cascades disruption has less impact here (compared to potato distribution) Only 1 rack in the base case is served by a terminal that would require cross-cascades travel – that rack could easily switch terminals Increased by 13.3 minutes per trip

Diesel Industry Flows: Summary Minimal cross-Cascades travel Multimodal network avoids mountain passes Distributed terminals provide buffers Can estimate network segment importance using known information… BUT cannot assess flows because of lack of information Diesel is a higher-value industry, but potatoes are more sensitive to road network disruptions Diesel distribution is HIGHLY vulnerable to pipeline and/or barge disruption