IAHR President's Webinar 1: Saving Lakes from Nutrient Enrichment and Global Warming



IAHR President's Webinar 1
Saving Lakes from Nutrient Enrichment and Global Warming

25 February (24 Feb. in the Americas) 2021

 Registration and LIVE Page Access

Click the following link to go to the LIVE page where the online event will be live-streamed. Pre-event registration is not needed, but log-in is required.

Go to LIVE Page (Playback Now)

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We are honored to have some of the world's top scholars and researchers in the webinar:

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Prof. Jörg Imberger

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Prof. Yong Liu

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Prof. Stephen Monismith


Joseph Lee.jpg

Prof. Joseph Lee

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Prof. Angelos Findikakis


IAHR President's Webinar is a serial of events that aims at inspiring, disseminating and catalysing knowledge and thinking on the most important water engineering and related environmental issues of present times through high-quality and tasteful online events.  

The first of this series of webinars will be centered on the topic of lake environmental hydrodynamics, featuring Prof. Jorg Imberger, University College London, UK and University of Miami, USA as the keynote lecturere, as well as two invited speakers: Prof. Yong Liu from Peking University, China and Prof. Steve Monismith from Stanford University, USA, and will be co-chaired by IAHR President Prof. Joseph Lee and former IAHR Vice President Prof. Angelos Findikakis.

Prof. Jorg Imberger, after a review of the important physical processes and the non-dimensional numbers that govern each of hydrodynamic processes in a lake, will explain how the increasing stability of deep lakes is resulting in a delay in lake turnover and an ever-increasing volume of the zero oxygen hypolimnion that is killing the endemic biodiversity in deep lakes, as well as how the new adaptive, real-time, self-learning management approach may be used to avoid this disaster from happening. [Abstract of this talk]

Prof. Yong Liu will focus more on a case study, talking on the pollution of the Lake Dianchi, and the mitigation actions launched to restore one of the three most polluted large shallow lakes in China. Models will also be explained to analyze the temporal variations of 30-year water quality change and explore the joint effect of external nutrient input and internal cycling. [Abstract of this talk]

Prof. Steve Monismith will present field observations of these flows drawn from a coral reef in American Samoa, a seagrass bed in Palau, and a kelp forest in Baja. In the first case, drag can be related explicitly to the reef geometry at cm scales. In the second case, drag varies strongly with velocity reflecting the re-configuration of the drag elements due to bending, behavior that can be modeled with some accuracy. In the final case, he will show velocity measurements taken over the span of several years during which time the condition of the kelp forest varied between non-existent and dense.  [Abstract of this talk]

Algal bloom; Hydrohynamics of lakes; surfaces fluxes and basin scale response; inflow/outflow dynamics; gravitational motions; benthic boundary layer dynamics; energy cascade; stratification control


Click the thumbnails above to view some larger images from the speakers.

 Time in Different Zones

This event will be organized on Thursday, February 25, 2021 in most continents except for the North and South Americas where it will still be February 24.

  • 01:00-04:00 (GMT, UTC+0)

  • 17:00-20:00 (USA Pacific Standard Time, February 24, UTC-8)

  • 02:00-05:00 (Central European Time, UTC+1)

  • 09:00-12:00 (China Standard Time, Western Australian Time, UTC+8)

More local time can be found by clicking here.


  • Introduction (5 mins)
    Prof. Joseph HW Lee, IAHR President, Macau University of Science and Technology, China

  • A Design Strategy for Saving Lakes from the Impact of Nutrient Enrichment & Global Warming (90-120 mins) [Abstract] [Slides]
    Prof. Jörg Imberger, University College London, UK; University of Miami, USA

  • Water Quality Restoration from Increasing Nutrient Enrichment: A Review of 30 Years' Efforts for Hyper-Eutrophic Lake in China (30 mins) [Abstract]
    Prof. Yong Liu, Peking University, China

  • Flow through Living Roughness (30 mins) [Abstract]
    Prof. Stephen Monismith, Stanford University, USA

  • Discussion and Q&A (20 mins)
    Prof. Joseph HW Lee, IAHR President, Macau University of Science and Technology, China
    Prof. Angelos Findikakis, 
    Senior Principal Engineer and Bechtel Fellow, Bechtel Corporation, USA

 Prof. Imberger's Related Talks

At this webinar, Prof. Jorg Imberger will be giving the 2nd talk of a series of three closely-related lectures:

  • Talk 1: Summary of the problems motivated by the idea but you cannot solve a problem until you see that you have a problem. [Given during the IAHR 85th Anniversary Summit on December 15, 2020] [Introduction] [Playback] [Video]

  • Talk 2: Basically a technical tutorial for the practicing engineer how to implement the solutions for the problems. [To be given at this webinar] [Introduction] [Playback] [Video]

  • Talk 3: This talk may be viewed as a user manual of how to use technology to solve the Lake problems and how to integrate this solution into the fabric of the stakeholder community. [To be given during the Fundamental Issues of Global Water Security: Linking Water Security to Nature on March 22, 2021] [Introduction] [Playback]

Click here to find out more details about these 3 talks.



This webinar is sponsored by China Institute of Water Resources and Hydropower Research (IWHR), China's top national research institute on water resources and hydropower under the direct administration of China's Ministry of Water Resources. IWHR also hosts IAHR's Global Secretariat Beijing.

If you have any suggestions or questions about this webinar, or if you would like to organize a webinar using IAHR's platform, or if you would like to support future IAHR webinars, please contact our Technical Division Programme Officer Ms. Jenny Lu.


 Certificate of Participation

Certificate of Participation is provided only when you request it. Make sure you have the correct information (Full name, Affiliation, etc.) in your IAHR account and send your request to You are eligible for the certificate only if you log into the LIVE page when the event is live-streamed.

 Related links

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