Han-Sup Han

Han-Sup Han

Professor, Department of Forestry and Wildland Resources at Humboldt State University


Dr. Han’s primary research focuses on forest operations which involve the application of various forest management tools and processes to achieve a wide range of objectives in forest management. He has been evaluating various harvesting equipment and systems that are commonly used in timber harvesting and biomass operations. Especially, development of innovative operations logistics for forest biomass harvesting, processing and transportation for energy generation has been a main theme of my research for the last 15 years. His current research interest is to develop efficient biomass supply chain logistics that are specially designed for enhancing economic and technical feasibility of forest residues and small-diameter trees. Collaboration with other disciplines such as wood chemistry (e.g. torrefaction) and forest ecology (nutrient recycling with torrefied wood chips) has been also a key approach to comprehensively address recent challenges related to harvesting and utilization of dead trees and fuel reduction thinning materials. Recently, Dr. Han, along with 13 Co-PIs (Principal Investigators) and research partners, has received a $5.88 million grant from the U.S. Department of Energy to conduct biomass research on the utilization of forest residues for production of bioenergy and biobased products. The research collaboration effort integrates three major tasks of 1) production of quality feedstock, 2) development of mobile biomass conversion technologies, and 3) economic/environmental analysis, as explained in the research project web site at www.wastetowisdom.com.

Presentation Topic

Biomass Utilization, Harvesting, and Markets

Presentation Description

Emerging biomass conversion technologies, such as mobile biochar or pyrolysis/torrefaction machines, aim to use forest residues left after extracting merchantable timber or fuel reduction thinning operations. The residues generated from these operations typically produce low quality feedstock which may not be suitable for new biomass conversion technologies. In an effort to increase feedstock quality, we separated sub-merchantable trees and tops and processed them to create stem wood piles during the timber harvest. Sorting and processing the forest residues can facilitate the production of quality feedstocks by chipping processed stem woods, instead of grinding a mix of tops, limbs and branches. The quality of the feedstock produced from the sorted materials was characterized by moisture content, particle-size distribution, bulk density, and ash content.

Our study results showed that a high quality feedstock can be produced by separating stem wood from other residues during a timber harvest. The cost of sorting biomass trees and tree-tops slightly increased the overall cost of the timber harvest operation, compared to the typical practice of piling the forest residues altogether. However, this additional sorting and processing practice of tree tops effectively facilitates increased utilization of forest residues to high value markets such as post & poles and dowels and thereby enhancing the financial potentials as well as avoiding open burning and facilitating tree replanting tasks.

This presentation also explains the testing results on four different methods (teepees, criss-cross, processor piled, and scattered) used to reduce moisture content in forest residue materials left on a timber harvest site. The information to be presented at this workshop is based upon the Waste to Wisdom (http://wastetowisdom.com/) research work supported by a grant from the U.S. Department of Energy under the Biomass Research and Development Initiative (BRDI) program.

Workshop Schedule

Registration Opens

10:00 AM

Light Lunch

11:00 AM

Key Note Speaker

12:00 PM

Panel: The Economics of Forest Restoration

Topics: Making Forest Restoration Economical, Contractor Logging Costs & Opportunities for Cost-savings, The Economics of Dry Forest Stewardship Projects, and Using the Land Fin Tool

Panel: From Inception to Implementation, Planning for Success

Topics: Planning at the Landscape Scale, Making Use of Good Neighbor Authority, Authorities to Maximize Restoration, and Packaging Federal Resources for All-lands Restoration

Panel: Cutting Edge Technologies for Sale Layout and Implementation (Part 1)

Topics: Virtual Boundaries and Discernable Boundaries, Integration of Unmanned Aerial Vehicles in daily forest operations: from cruising to regeneration survey, Using Avenza PDF Maps in Concert with Cut-To-Length Harvesting Systems, and Planning Ground-based Harvest Operations to Limit Soil Impacts

Reception and Featured Speaker

5:30 PM


7:00 AM

Featured Speaker

Panel: Forest Treatments for Riparian Health

Topics: Hydrology Concerns for Treatments in Riparian Areas, Riparian Thinning Using Cut-to-Length, and Riparian Thinning: An Example from the Deschutes National Forest

Panel: Managing Good Fire at the Right Place and Right Time (Part 1)

Topics: Managed Fire: A tool or a Hazard? An in-depth discussion with the Lakeview Forest Stewardship Group.

Panel: Managing Good Fire at the Right Place and Right Time (Part 2)

Topics: Prescribed Fire at Scale and Contracting Prescribed Fire

Panel: Bridges and Water Crossings: Challenges and Opportunities

Topics: Roads, Crossings and Culverts, Low-cost approaches to Low-Volume Roads and Water Crossings, Prioritizing Roads, Crossings & Culverts with NetMap.

Lunch: A View from All Sides: Perspectives on Implementation Efficiencies, Challenges, & Opportunities

Summary Statements from Forest Service Staff, Collaborative Member and Industry Representative discussed over Lunch

11:45 AM


Have a safe trip home!

1:00 PM


7:00 AM

Featured Speaker: Do Collaboratives Matter in Litigation?

with Susan Jane Brown

Panel: New Opportunities for Conventional Harvesting Systems and Biomass Utilization

Topics: Cut-to-Length vs Whole Tree Logging Systems, Biomass Utilization: Harvesting and Markets, and Managing Slash: Needs, Challenges, Opportunities

Panel: Steep Terrain Harvesting Systems

Topics: Skyline Logging: New Approaches to Traditional Systems, Steep Slope Logging, and Tethered Assist


with optional practical application activity

12:30 PM

Facilitated Conversations on the morning’s topics

Continue the discussion: The key elements of making forest restoration work economically viable

Panel: A Grounded Approach: Soil Considerations for Harvesting

Topics: Soil Matters: Improving Forest Landscape Planning and Management for Diverse Objectives with Soils Information and Expertise, Soil Resources Management for Logging in Steep Slopes, Interaction of Steep Slope Equipment with Soil Resources

Panel: Cutting Edge Technologies for Sale Layout and Implementation (Part 2)

Topics: Tablet applications for Implementing Silvicultural Prescriptions, Forest Restoration in the Tablet & Smart Phone era: Marking and Realtime Monitoring using the ICO APP, and Non-contact tree measurement for forest harvesting machines

Panel: Designation Methods: Lessons Learned

Topics: Alternative Contracting Methods and Implementation Strategies for Commercial Harvest, DxP and DxD

Facilitated Conversation on Afternoon Topics

or optional practical application activity

Dinner on your own

Enjoy one of the many area dining options at your leisure.

6:00 PM
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