Toward Improved Simulations of Disruptive Reservoirs in Global Hydrological Modeling by Shrestha et al. (2024)

Pallav Shrestha
Pallav Shrestha, Helmholtz Center for Environmental Research

This April (2024), a paper in Water Resources Research caught the attention of our Blog Committee. Intrigued by its innovative findings using a mesoscale hydrology model, we couldn’t resist going deeper. We had the pleasure of discussing this research with Pallav Shrestha, the lead author, and a prominent researcher at the Helmholtz Center for Environmental Research in Germany. Here’s an inside look at our fascinating conversation and the insights we uncovered.


Please introduce yourself to our readers.

I am Pallav Kumar Shrestha. I come from Nepal and currently reside in Germany. I joined the lab of Luis Samaniego at UFZ in 2017 as a PhD researcher, focusing on locally relevant flood forecasting in managed river basins at a global scale. I am one of the active developers of the mesoscale hydrological model (mHM) and the lead developer of the SCC river network upscaling technique and mHM’s reservoir module. My PhD journey is finally coming together with the acceptance of two recent publications: one in Nature Communications and another in Water Resources Research. Today, I’ll delve into the latter.

What led you to integrate a random forest model with the mesoscale Hydrological Model in your study?

While developing the reservoir module in mHM, we were able to satisfactorily represent all aspects of reservoirs based on physics, except for one: the water demand. Demand is a complex human response, highly discontinuous, and is therefore less suited to being modeled as a continuous function like other hydrological processes. For this reason, we hypothesized and demonstrated that machine learning techniques such as random forest could be available option to estimate demand. It is important to note that the random forest modeling exercise was external to mHM, and the fitted demand functions as model input.

Could you explain the significance of the Kling-Gupta Efficiency improvement noted in your study?

Sure. The incorporation of reservoirs in large-scale modeling applications is not a new concept. However, the improvement in Kling-Gupta Efficiency (KGE) for streamflow observed in our study, compared to the naturalized flow, is significantly higher than those reported in previous literature. We succeeded in matching the sub-seasonal details of the observed hydrograph, whereas the majority of previous studies focused only on matching seasonality. The improved KGE implies that modelers can now use mHM to represent reservoir regulation more accurately in their large-scale streamflow simulations.

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Navigating parenthood as an early career scientist – Part 2: The question of organization.

A contribution by Diana Spieler, Lina Stein and Rodolfo Bezerra Nobrega

Academia and family are often described as ‘greedy institutions’—a term coined by Coser in 1974. Both demand extensive and open-ended time commitments, which can easily send parents into a spiral of guilt for their perceived inability to fully meet the demands of both their professional and parental roles. This perpetual balancing act is seemingly impossible to perfect. To understand how academic parents navigate these challenges, we asked them how they organize family life around their research demands, how they handle conferences, relocating for the job or their day-to-day routines. This is what they said:

1. Illustration generated by AI technology provided by OpenAI (DALL-E)

Daily Routines

Most parents in our survey reduced their weekly working time to better balance family and career demands. Some choose to work four days a week, while others opt for fewer hours per day. This approach provides flexibility for managing a schedule with kids, particularly when both parents adopt it. By adjusting their work schedules, parents could effectively compensate for each other, stepping in as needed. This however often requires a strong commitment between partners (if not a single carer) in planning daily routines, prioritizing work responsibilities and establishing clear communication channels. It also generally comes with less income.

Organization” is a big part of our family life. […] This insight did not come naturally to me as I am typically terribly unorganized.

While a clear weekly structure and distribution of responsibilities seems essential to most, one respondent reminded us that it is also important to stay flexible in your mind for potential sudden changes. Having plans A, B ,C and possibly even G for important meetings or deadlines can be helpful because there is a definite increase in sick days (of parents and children) or the “occasional calls from the principal for less appealing reasons”.

The most useful strategy for me is to use the early mornings well and to stay flexible in the mind in regards to sudden changes.

Many parents also shared that they sleep less, wake up early or stay up late to handle their workload or catch up on tasks interrupted by family commitments. To compensate for care hours during the week, they sometimes dedicate time on weekends for work. This practice of overworking is common in science (Kucirkova, 2023) and underscores a systemic failure that is especially hard on parents or anyone not following a direct career path (Staniscuaski, 2024). Effective time management and prioritization of tasks seem crucial for maintaining academic productivity without resorting to 60-hour work weeks. This requires working with high focus and efficiency, particularly if time for additional tasks like reading papers or learning new programming skills is necessary.

The most useful strategy for balancing work with family life is to have a pretty clear cutoff when leaving work – I’m unavailable from 4 PM onwards – and having a clear plan for how I will use the limited hours that I am in the office.” 

While some male respondents acknowledged continuing to work full-time while their wives managed childcare, the majority made deliberate efforts to share childcare responsibilities, aiming for a 50-50 or 60-40 split between partners. Achieving a completely even split was often challenging, especially during the child’s first year, but generally became more feasible starting at the age of 1.5 to 3 years old. Shared childcare duties also helped distribute the care of a sick child, arranging schedules around meetings, deadlines and fieldwork and promoting a more equitable distribution of the mental load, which is often disproportionately borne by mothers. One male respondent who worked full-time found it difficult to take parental leave when his child was born, despite being legally allowed. He deliberately advertised to claim your rights and speak up for yourself when it comes to parental leave and reduced working hours as he regretted that it took him at least 8 years before he felt like it was okay to take time off for family.

We need role models! Especially for men that often only know their own fathers as sole providers and mothers as sole caregiver.

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EGU24 Short Course – DataViz: Meet the editors (1): how to write and revise your manuscript

During EGU24, Young hydrologic society and Early career hydrologic sub-division co-organized the short course ‘Meet the editors part 1’.
The session was highly well received, thanks to our speaker Dr. Heidi Kreibich and two panelists Dr. Mario Mendiondo, and Dr. Stacey Archfield!

All our speakers raised the importance of mental health before, during and after publication.

Picture taken during the EGU24 short course.
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International Workshop on Urbanization and Sustainable Water management strategies

IAHS is delighted to announce a call for abstracts for an upcoming 2-days workshop focusing on the interface of urbanization and water management strategies, with a particular emphasis on addressing challenges and opportunities in the global south.

The workshop is hosted by LMU Munich, organized by the Urban Water Working Group of the IAHS under the HELPING decade, and supported by LMU Munich Postdoc Support funding and Carl Friedrich von Siemens Stiftung.

Abstracts should be submitted online by May 15th, 2024.

Additional information available at https://survey.ifkw.lmu.de/iahs_UrbanWater_2024/

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EGU24 Short Course – DataViz: Visualise your data effectively and avoid common pitfalls

During the conference EGU General Assembly 2024 held in Vienna a few days ago, the Short Course “DataViz: Visualise your data effectively and avoid common pitfalls” was delivered. This course was co-organized by the Young Hydrologic Society (YHS) and was designed to help scientists (early career scientists in particular) improve their data visualization skills in a way that the research outputs would be more accessible, less biased and more understandable within the scientific community.

Picture taken during the EGU24 short course.
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