Profiles and Activities : National University Corporation Fukushima University


Yoshiyuki Yokoo(Associate Professor)

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Affiliated Specialty Division Division of Environment System Management
Specialized Field of Study Watershed Hydrology
Final Academic Background Department of Civil Engineering, Graduate School of Engineering, Tohoku Universty
Academic Degree Ph.D.(Tohoku University)

Courses In Charge

Introduction to Watershed Management and Planning
This lecture gives an overview of researches on watershed hydrology introducing current and future issues in this research area in order to master a viewpoint on such issues.
Watershed Management and Planning
This lecture instructs basic knowledge and skills of hydraulics which is necessary for watershed management and planning in a exercise style, so that participants can be capable of understanding and analyzing practical water issues by themselves.
Advanced watershed hydrology I
This lecture educates advection-diffusion equation which can be used for modeling water and contaminant transports in a watershed and explains how to solve the equation numerically in a exercise style. Specifically, it aims participants can obtain a skill to solve the equation numerically by using a programming language of Fortran that is often used in large-scale numerical computations.
Advanced Watershed Hydrology II
Following Advanced Watershed Hydrology I, this lecture focuses on hydrological cycle and its modeling of watersheds with different climatic and geographic conditions. In addition, anthropogenic impacts on hydrological cycle and interactions between hydrological cycle and vegetation activity are to be discussed as the closing of this lecture.

Main Research

Investigating the climatic and geographic controls on the shape of flow duration curve and mapping groundwater recharge potential
We invstigate the effects of climatic and geographic conditions of a watetershed on the shape of flow duration curve (FDC) so that we can draw FDC based on such conditions. We also try to generate a groundwater recharge potential map, as a biproduct of this research.
Understanding watershed hydrological cycle based on streamflow quantity and quality
The present study aims for understanding hyrological processes of a watershed based on streamflow quantity and quality.
Understanding natural processes such as forest fire and carbon cycle
This study attempts to understand natural processes within a watershed such as forest fire and carbon cycles in terms of data analysis.

Introduction of Laboratory

The mission of our group is understanding the climatic and geogeaphic controls on hydrological cycle of a watershed. Not only socially valuable information but also outstanding intelligence reliable for the next century are the target outcomes of this group. We aim for producing talented people who can distinguish key processes inherent in observed hydrological data for understanding and modeling such processes.

Web site:

Recent Writings, etc.

1. Leong, C., Yokoo, Y. (2017) Estimating flow duration curve in the humid tropics: a disaggregation approach in Hawaiian watersheds, Hydrological Research Letters, 11, 175-180. DOI: 10.3178/hrl.11.175.
2. Yokoo, Y., Chiba, T., Shikano, Y., Leong, C. (2017) Identifying dominant runoff mechanisms and their lumped modeling: a data-based modeling approach, Hydrological Research Letters, 11, 128-133. DOI: 10.3178/hrl.11.128.
3. Yokoo, Y., Udo, K. (2016) Connectivity between sediment storage in dam reservoir and coastal erosion: implication through zonal mapping of monitoring data, Journal of Coastal Research, Special Issue 75, 725-729. DOI: 10.2112/SI75-145.1.
4. Fischer, H.W., Yokoo, Y. (2014) Preliminary comparison of radioisotope concentration in sewage sludge after the Fukushima and Chernobyl accidents, Energy Procedia, 59, 256-262. DOI:10.1016/j.egypro.2014.10.375.
5. Yokoo, Y., Wattanakarn, C., Wattanakarn, S., Semcharoen, V., Promasakha na Sakolnakhon, K., Soralump, S. (2014) Storage under the 2011 Chao Phraya river flood: An interpretation of watershed-scale storage changes at two neighboring mountainous watersheds in northern Thailand, Hydrological Research Letters, 8, 1-8. DOI: 10.3178/hrl.8.1.
6. Kobayashi, S.,Yokoo, Y. (2013) Estimating watershed-scale storage changes from hourly discharge data in mountainous humid watersheds: toward a new way of dominant process modeling, Hydrological Research Letters, 7, 97-103. DOI: 10.3178/hrl.7.97.
7. Yokoo, Y., Kazama, S. (2012) Numerical investigations on the relationships between watershed characteristics and water balance model parameters: searching for universal relationships among regional relationships, Hydrological Processes, 26, 843-854. DOI: 10.1002/hyp.8299.
8. Ono, K., Kazama, S., Kawagoe, S., Yokoo, Y., Gunawardhana, L. (2011) Possible earthen dam failure mechanisms of Fujinuma reservoir due to the Great East Japan Earthquake of 2011, Hydrological Research Letters, 5, 69-72. DOI:10.3178/hrl.5.69.
9. Yokoo, Y., Sivapalan, M. (2011) Towards reconstruction of the flow duration curve: development of a conceptual framework with a physical basis, Hydrology and Earth System Sciences, 15, 2805-2819. DOI:10.5194/hess-15-2805-2011.