Meet Tim Hanrahan, PhD
  
Title
Senior Fluvial Geomorphologist

Expertise
Fluvial geomorphology
River hydraulics
Sediment transport
Hyporheic processes
Habitat modeling


Location
Richland, WA

Hired
2012

After spending his formative years in and around rivers and lakes, Tim set his sights on a career that would involve rivers. “During my undergraduate years in Madison, Wisconsin, I became aware of careers associated with these interests—actually getting paid to play in rivers—and I spent a lot of time canoeing the Wisconsin River trying to figure out how to get one of those careers,” he relates.

It’s Tim’s job as GeoEngineers’ recently hired geomorphologist to describe the physical settings of the rivers and floodplains within which client projects are located, so that the team and the clients have a solid understanding of how these systems behave. “I love rivers and enjoy observing all their idiosyncrasies,” he says, adding, “I like that the projects I work on are making a difference in improving the environment around us.”

Tim enjoys spending his leisure time adventure-traveling with his spouse and two daughters—whether for day hikes in the nearby hills, weekend jaunts to the lake, or urban excursions for music, theater and dance. He and his family share a love of kayaking, swimming, snow skiing, snowshoeing and cycling. In his quieter moments, Tim likes to play guitar. “I am an amateur guitarist with wide-ranging interests in musical styles, most of which far exceed my abilities,” he says modestly.

Community


Selected Presentations & Articles

  • Hanrahan, TP, JR Scott, and JG Webster. "River restoration strategies: Four case studies of identifying and prioritizing actions," presented in the Process-based Restoration Symposium at the Western Division American Fisheries Society Annual Conference, Reno, NV, 2016
  • Hanrahan, TP, and RS Carnie. "Application of geomorphic process information to river restoration design for salmon habitat," presented at the (Re)envisioning Process-based Restoration Symposium at the American Fisheries Society Annual Conference, Portland, OR, 2015
  • Hanrahan, TP, ML Troost, T Maguire, and D Risso, "An evaluation of irrigation diversion effects on sediment transport and channel morphology in the upper Snake River, Idaho," presented at the American Water Resources Association Annual Conference, Tysons Corner, VA, 2014
  • Hanrahan, TP, AP Levell, T Maguire, D Risso, and H Osborne, "Geomorphic function and restoration potential of spring creeks in southeastern Idaho," presented at the American Water Resources Association Annual Conference, Portland, OR, 2013
  • Hanrahan, TP, "Implications of historic river channel modifications on contemporary restoration opportunities," presented at the American Geophysical Union Fall Meeting 2013, San Francisco, CA, 2013
  • Hanrahan, TP, and CR Vernon, "Evaluation of logjam scour in the context of reach-scale river channel adjustments," presented at the American Geophysical Union Fall Meeting 2012, San Francisco, CA, 2012
  • Hanrahan, TP, and MC Richmond, “Quantifying large river habitat restoration potential through hydrodynamic modeling and geomorphic analysis,” an invited paper presented to the International Conference on the Status and Future of the World’s Large Rivers, Vienna, Austria, April 2011
  • Hanrahan, TP, and CR Vernon, “Evaluating river restoration objectives as research hypotheses: a case study of engineered log jams,” presented at the American Geophysical Union Fall Meeting, San Francisco, CA, 2010
  • Vernon, CR, and TP Hanrahan, “Digital photograph analysis to quantify fine-grained sediment composition of riverbed surfaces,” presented at the American Geophysical Union Fall Meeting, San Francisco, CA, 2010
  • Leek, R., J. Q. Wu, L. Wang, T. P. Hanrahan, M. E. Barber, and H. Qiu. 2009. Heterogeneous characteristics of streambed saturated hydraulic conductivity of the Touchet River, south eastern Washington, USA. Hydrological Processes DOI: 10.1002/hyp.7258.
  • Hanrahan, T. P. 2008. Effects of river discharge on hyporheic exchange flows in salmon spawning areas of a large gravel-bed river. Hydrological Processes 22(1): 127-141, DOI: 10.1002/hyp.6605.
  • Geist, D. R., C. J. Murray, T. P. Hanrahan, and Y. Xie. 2008. A model of the effects of flow fluctations on fall Chinook salmon spawning habitat availability in the Columbia River. North American Journal of Fisheries Management 28: 1911-1927, DOI: 10.1577/M07-074.1.
  • Geist, D. R., E. V. Arntzen, C. J. Murray, K. E. McGrath, Y. J. Bott, and T. P. Hanrahan. 2008. Influence of river level on temperature and hydraulic gradients in chum and fall Chinook salmon spawning areas downstream of Bonneville Dam, Columbia River. North American Journal of Fisheries Management 27: 30-41, DOI: 10.1577/M07-009.1.
  • Hanrahan, T. P. 2007. Large-scale spatial variability of riverbed temperature gradients in Snake River fall Chinook salmon spawning areas. River Research and Applications 23: 323-341, DOI: 10.1002/rra.982.
  • Hanrahan, T. P. 2007. Bedform morphology of salmon spawning areas in a large gravel-bed river. Geomorphology 86: 529–536, DOI: 10.1016/j.geomorph.2006.09.017.
  • Hanrahan, T. P., D. R. Geist, and E. V. Arntzen. 2005. Habitat quality of historic Snake River fall Chinook salmon spawning locations and implications for incubation survival. Part 1: Substrate quality. River Research and Applications 21 (5): 455-467.