[Enviro-lunch] Enviro-Lunch this Thursday (2/20, 12 pm)

[Kyungjin Min]

[image: image.png]

Good afternoon everyone,

This Thursday (2/20) Dipankar Dwivedi, a research scientist at Lawerence
Berkeley National Laboratory, will share his research in the Enviro-lunch
seminar series. Please check the abstract below and join us at SRE 475
(noon to 1pm).

*Title*:
Biogeochemical Controls on River Water Quality: Quantifying Dynamic
Surface-Subsurface Interactions using Reactive Transport Models

*Abstract*:

Groundwater and surface water interactions are spatially and temporally
diverse and depend on the landscape’s climatic and physiographic setting.
These interactions affect biogeochemical processes in riparian corridors.
Biogeochemical transformations that occur within the groundwater-surface
water interface play a vital role in the export of iron, carbon, and
nutrients to the river system, thereby influencing river water quality.
Although considerable progress has been made in hydrology and
biogeochemistry, significant knowledge gaps remain regarding how to
appropriately represent linked and non-linearly coupled hydrological and
biogeochemical processes in the next-generation mechanistic models. In this
seminar, I will present the level of complexity required to develop a
predictive understanding of a system with spatiotemporal variability and
scale issues. I will also demonstrate how dynamic surface-subsurface
interactions influence biogeochemical transformation and, subsequently,
river chemistry at two distinct hydro-geologic settings: (a) the Rifle
floodplain and (b) the lower East River site. The Rifle floodplain has a
relatively flat topography whereas the lower East River, with multiple
meanders, has a rolling-to-mountainous topography. Both sites are located
in Colorado, USA. Through this seminar, I aim to demonstrate how distinct
redox zones evolve, resulting from complex flow dynamics and sediment
characteristics. These ideas and approaches have broad applicability for
different environmental problems, such as the fate and transport of
contaminants, climate change, water resources management, and
biogeochemical cycling. The seminar will conclude with a discussion of the
possibilities for advancing the use of reactive transport models and future
research opportunities therein.

*Bio:*
[image: DD.png]

Dipankar Dwivedi is a Research Scientist in the Geochemistry Department
<https://eesa.lbl.gov/departments/geochemistry/> at Lawrence Berkeley
National Laboratory. His research focuses on reactive transport modeling,
soil carbon dynamics, redox processes, and organo-mineral interactions. He
also has extensive experience with machine learning techniques, and data
assimilation approaches. Dr. Dwivedi is currently working on developing new
approaches for monitoring water resources using smart data analytics.



KJ and Yang

Organizers for Spring 2020: KJ Min and Yang Yang
Faculty coordinator: Asmeret Asefaw Berhe


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You can find the semester schedule below.

*Date *

*Speaker *

*Topic *

*2/6*

Yang Yang

@ UC Merced

Altitudinal patterns of nutrient fluxes and pools at the Sierra Nevada



*2/13*

Jing Yan

@ UC Merced

Where small-scale process matters: linking transport behaviors of
nano-sized colloids and rhizosphere water, nutrient dynamics to soil
ecosystem functions

*2/20*

Dipankar Dwivedi

@ Lawrence Berkeley National Lab

Biogeochemical controls on river water quality: Quantifying dynamic
surface-subsurface interactions using reactive transport models



*2/27*

Lauren Hale

@ USDA

Utilizing rhizosphere microbiomes to improve soil health

*3/5*

Alex Leven

@ Fugro

Working outside of the academia

*3/12*

Luna Reyes

@ UC Merced

Making a homepage using R



*3/19*

Eric Slessarev

@ Lawrence Livermore National Lab

Using the state-factor concept to model pedogenesis at the global scale





*3/26*

spring break



*4/2*

Zulema Valdez

@ UC Merced

Climate Change and Wildfire Sufferance among Rural California Residents

*4/9*

Caddie Bergren

@ UC ANR

Climate smart agriculture



*4/16*

Hannah Waterhouse

@ UC Davis

Managing greenhouse gas emissions from agricultural soils



*4/23*

TBD



*4/30*

Ryan Bart

@ UC Merced

Coupling ecohydrology with wildfires



*5/7*

Tracey Osborne

 @ UC Merced

TBD
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