Dr. Power is a food web ecologist at UC Berkeley, where she leads the Power lab which has compiled careful, long term data sets in the Angelo Reserve in Northern CA. In addition to her early work, in Panama and the Ozarks - which we touch on briefly - Dr. Power’s  multi-decadal data sets on the Eel River, have yielded remarkable findings about how food webs function in gravel bed rivers…and spoiler alert, it sometimes involves the sorts of things we tend to talk about here…like the gravel -...

Dr Alain Recking has quantified gravel bed transport with just about all the tools available to our discipline. In addition to substantial field work- Dr. Recking has done some important and influential flume experiments. We have talked and will talk about hiding and armoring quite a bit in this podcast, because they are difficult ideas, that are hard to measure and simulate,  and critical to gravel bed processes. But Dr. Recking’s contributions to this vertical sorting conversation...

A couple years ago, my agency asked me to write some guidance on sediment modeling, so, I reached out to the morphological modelers I knew, and particularly the model developers who write the morphological model code other people use. I asked them about the common failure modes they have seen and best practices they teach, and realized we had all essentially spent a decade or two, learning the same principles.   So when the US federal agencies held their periodic Federal interagency sediment...

I’ve heard people call Tony the godfather of Sediment Transport Modeling and - as you’ll hear in our conversation - he very well may be the first person to use a computer to answer an engineering scale sediment question. But most people about my age and older, know Tony for developing the first generalized sediment model.  He was part of the original team here at the Hydrologic Engineering Center (HEC) where he developed HEC6, a 1D sediment transport model that was industry standard for...

Dr. Jim Selegean is the Sediment Transport Specialist at the Corps Detroit District where he studies the rivers and sediment loads into the great lakes as well as inland costal processes.  He is also a professor at Wayne State in Detroit. And that joint position has helped him mentor many young scientists and engineers  throughout the years, geomorphically trained Hydraulic engineers who not only currently populate the Detroit district but also includes what we call the Detroit diaspora, ...

Dr. Astrid Blom is a professor Civil Engineering & Geosciences at Delft University of Technology in the Netherlands is perhaps best known for her recent reach and rive scale work, modeling hundreds of kilometers, sometimes for hundreds or thousands of years.  These models explore the long-term equilibrium state of river responses to human modifications and the alternate potential futures associated with different climate change scenarios and management practices.  Most of her recent work...

In the previous episode, we talked to Dr. Marcelo Garcia about the astonishing compilation of sediment science he edited, the ASCE Sedimentation Manual.    In this episode, we turn to some of his work, covering a wide range of topics, but landing for a while on sedimentation hazards including mud and debris flows, the Bulle Effect, and two transport paradigms (the Bagnold vs the Einstein approaches).   Dr. Garcia is professor at the University of Illinois-Urbana and the director of the Ven...

Dr. Marcelo Garcia holds an endowed chair in Hydraulics at the University of Illinois-Urbana – where he has taught for more than thirty years, and runs the remarkable Ven Te Chow hydraulic and sediment laboratory.  His award page reads like a who’s-who of the Legends in our field.   These include but are not limited to: The Einstein Award,  the Rouse Award,  and the Yalin lifetime achievement award. And he is a Distinguished member of the American Society of Civil Engineers and the an...

Dr. David Montgomery has been so prolific, that for several years I actually thought he was two people: First, Dr. D. Montgomery is a well known geomorphologist from the University of Washington (and a 2008 MacArthur Fellow) whose name is on much of the seminal, high-gradient channel transport and classification literature.  And then there David Montgomery,  the narrative non-fiction author from Seattle who wrote books like Dirt, The Rocks Don’t Lie, and The Hidden Half of Nature. It...

We plan to start releasing season three on the first week of the new year.   It was a fun and helpful season, which I'm looking forward to releasing. This preview overviews the guests and topics of the season with fun pull quotes from most of the guests. Look for the next episode the first week of January. This series was funded by the Regional Sediment Management (RSM) program. Stanford Gibson (HEC Sediment Specialist) hosts. Mike Loretto edited the episode and wrote and performed the...

Jennifer Bountry leads the Sedimentation and River Hydraulics Branch of the US Bureau of Reclamation's Technical Service Center in Denver, CO where she helped to coordinate and draft an interagency guidance document on scaling sediment transport analyses to the project risk.  It is a helpful and important document that I recommend to any group moving towards a dam removal, to help them triage the analyses required for their decommissioning.  Jennifer was also involved in the analyses for...

In the first two episodes of this season Dr. Annandale and Dr. Morris talked about reservoir sediment management practices all over the world.  But examples in the continental US were noticeably absent.   Reservoir sediment management in the US has encountered some challenges that have made US agencies slow to adopt these practices.  But Dr. Paul Boyd and Dr. John Shelley are involved in more reservoir sediment management initiative in the United States than anyone I know.  Dr. Boyd and Dr....

Dr. Greg Morris wrote the first text on reservoir sediment management, which generated the categories and set the parameters for a lot of the work and conversations surrounding the topic in the last three decades.  Most of us who work in this field got our start with his Reservoir Sedimentation Handbook.  But he has also likely worked on more reservoirs with sedimentation issues - in more settings - than anyone else and has an uncommon reservoir of practical - on the ground - wisdom to...

Dr. George Annandale has been advocating for forward thinking about global water supply for decades...which is more connected to sedimentation processes than you might imagine.  In his book, Quenching the Thirst he makes the case that reservoir sedimentation is one of the major challenges to future water supply and managing sediment at new and existing projects is a critical component of sustainable development. Dr. Annandale has worked on multiple projects at various scales both as a...

The RSM River Mechanics Podcast is returning with a summer mini-season on reservoir sediment management.  We recorded four episodes on this topic with some remarkable guests, so we're running them together this summer as a shorter "Season 2" before we release a full season this fall.  Episodes include: Ep 2:1 – Dr. George Annandale on the Motivation, Economics, and Approaches to Reservoir Sediment Management Ep 2:2 – Dr. Greg Morris on Reservoir Sediment Management Techniques and...

We are wrapping up season 1 with the second half of our first interview.  This is the rest of my conversation with US Army Corps of Engineers River Mechanics and River Engineering Subject-Matter Expert, Dr. David Biedenharn. If you have feedback on this season, recommendations for season 2 guests, or want to weigh in on our classic paper survey, there is a google form on the podcast website below. Video shorts and other bonus content are available at the podcast...

 The regressive erosion on the Rio Coca (Ecuador) may be the morphological event of our generation.  But, because it happened in February 2020, when there was not much room in the news cycle, most people haven't heard about it...even in the geomorph community.  In this episode we try to rectify that.  I talked to Pablo Espinoza Giron and Pedro David Barrera Crespo, two of the scientists/engineers who have been working on the Ecuadorian response since the beginning.  Video shorts and other...

Dr. Richard Iverson led the mud and debris flow investigations at the USGS Cascade Volcano Observatory for years, including large scale flume and numerical work that unlocked a remarkable number of new insights about these high-concentration flows.  His  findings have influenced the way I  think about these events more than any other source. With the rising interest in post-wildfire debris flow hazards, these events are getting more attention, so these findings have never been more salient. ...

Dr. Katie Brutsche led the Regional Sediment Management Program for several years.  Regional Sediment Management is the "RSM" in the title of this podcast, and the reason this project exists.  RSM is the aspirational conceptual model of the Corps of Engineer's sediment management over the last couple decades.  We talk about the principles of RSM, the RSM process, some example projects, sediment budgets, and some surprising stats that you probably don't know about dredging. Before Dr. Brutsche...

 I recently described Chris Nygaard as the Corps’ BSPS, our 'Big Sediment Pulse Specialist.'  He led sediment analysis and modeling on the Corps’ latest evaluation of Mount Saint Helens downstream-sediment impacts and a dam removal alternative on the Snake River.  In those projects he analyzed the fate of sediment pulses (real or hypothetical) on the order of hundreds-of-millions of tons.  But Chris also recently spent a couple years as a project engineer with Bonneville Power’s, where he got...

We plan to occasionally push out short bonus episodes between our longform conversations.  This first bonus short is a conversation with two of the organizers of the Federal Interagency Sediment Conference, which will be in St Louis in May.  SEDHYD is a conference that specializes in applied river mechanics and engineering topics, and has a lot of overlap with the topics of the conversations we're having on this feed.   So I invited two of the conference leaders to talk about it. Dr. Tim...

 John Remus leads a team of Corps of Engineers, sediment and river engineering, subject-matter experts.  This team (which I like to call "the Sediment Avengers") deploys to the Corps' most problematic sediment and morphological challenges around the country.  And that's a fitting role for the man who manages the river sometimes called the "Big Muddy."  In his "day job," John is currently the the chief of the Corps Missouri River Basin Water Management Division where he leads the team that...

Dr. Joanna Curran is probably best know for her early, academic, laboratory work on step-pool systems, gravel cluster turbulence,  and the Wilcock and Crowe transport function.  But she has since worked on northwestern rivers with several engineering firms, and most recently joined the Corps of Engineers at the Seattle District.  This academic/private sector/public sector perspective and experimental/numerical/field experience gives her a couple different multi-perspective views on rivers. ...

Ron Copeland has worked for the Corps of Engineers for over 5 decades, 52 years at the Los Angeles district and the Corps' Coastal and Hydraulics lab in Vicksburg Mississippi. He also worked for 10 years as a principle engineer at Mobile Boundary Hydraulics, which was the premiere 1D sediment transport modeling firm for decades.  But Dr. Copeland has not only been on a very short list of the very best 1D sediment transport modelers for decades, he also developed several equations and...