Dai YAMAZAKI's website


7th Mar, 2007, Trevelin, Argentina


Welcome to Dai YAMAZAKI's website!

Mail: yamadai [at] rainbow.iis.u-tokyo.ac.jp

Research Interests

Global Hydrodynamic Modeling

My major research topic is hydrodynamic modeling of surface waters at the global scale. The physics of surface water flow is relatively simple, but considerable efforts are required to represent complex river and floodplain topography which governs the surface water flow. My approach is the full-use of high-resolution satellite-based hydrographical datasets, which are available at the global scale. The goal of my study is to realistically simulate/predict the surface water hydrodynamics (river discharge, water level, flooded area) by proper approximation of the river and floodplain topography.

-- CaMa-Flood: Global River-Floodplain Model

-- FLOW: River Network and Topography Upscaling

Remote sensing of surface waters

In addition to the global hydrodynamic modeling work, the global-scale observation of surface waters is essential to understand the global hydrodynamics. I'm using some satellite products (DEM, water mask, inland water altimetry) for the validation, calibration, and the development of the global hydrodynamic model.

--MERIT DEM: A high-accuracy global DEM

--G3WBM: Global 3sec (90m) Water Body Map

--GWD-LR: Global Width Database for Large Rivers

--SWOT: Surface Water and Ocean Topography mission.


Japan Flow Direction Map / 日本域表面流向マップ

We developed the 1sec-resolution flow direction map for all over Japan (J-FlwDir: Japan Flow Direction Map)


-- J-FlwDir webpage

20 Nov, 2018

A very high accuracy global DEM is released.

We developed a very high accuracy global DEM (MERIT DEM: Multi-Error-Removed Improved-Terrain DEM), by removing multiple error components from spaceborne DEMs. The DEM is freely available for research and education purpose. Please visit the product webpage.

-- MERIT DEM webpage

1 June, 2017

Paper accepted on RSE: Accurate Global DEM

-- A high accuracy map of global terrain elevations

-- Yamazaki D., D. Ikeshima, R. Tawatari, T. Yamaguchi, F. O'Loughlin, J.C. Neal, C.C. Sampson, S. Kanae & P.D. Bates

-- Absstract in GRL

-- Geophysical Research Letters, 2017, vol.44, DOI: 10.1002/2017GL072874

31 May, 2017

Paper accepted on RSE: Global 90m Water Body Map

-- Development of a global ~90 m water body map using multi-temporal Landsat images

-- Dai Yamazaki, Mark A. Trigg, & Daiki Ikeshima

-- Absstract in RSE

-- Remote Sensing of Environment, 2015, vol.171, pp337-351, DOI: 10.1016/j.rse.2015.10.014

6 Nov, 2015

Global 3-second Water Body Map (G3WBM) v1.0 is released

We developed global 90-m water body map using LANDSAT GLS images. By using multi-temporal images, permanent water bodies and temporal flooded areas are distinguished. The water map is also free from observation gaps due to cloud/ice.

G3WBM webpage

8 Apr, 2014

Global Width Database for Large Rivers v1.2 is released

The new version of GWD-LR (v1.2) is released. Now the database is extended to the global coverage.

GWD-LR webpage

25 Aug, 2014

CaMa-Flood version 3.6.1 is released

The new version of CaMa-Flood v3.6.1 is released. The Global Width Database for Large Rivers (GWD-LR) and channel bifurcation scheme are implemented.

-- CaMa-Flood webpage

18 Aug, 2014

Awarded: Early Career Scientist Presentation Award from GEWEX

I got Early Career Scientist Award for my science talk at the GEWEX conference (The Hague, Netherland, 14-17 July 2014).

-- Title: Global hydrodynamic modelling of large-scale flooding in continental rivers.

-- GEWEX meeting web page


17 Jul, 2014

Letter on GRL: Channel Bifurcation in CaMa-Flood

A new channel bifurcation scheme is implemented in the CaMa-Flood global hydrodynamic model!

-- Regional flood dynamics in a bifurcating mega delta simulated in a global river model

-- Dai Yamazaki, Tomoko Sato, Shinjiro Kanae, Yukiko Hirabayashi, & Paul D. Bates

-- Absstract in GRL

-- Geophysical Research Letters, vol.41, published online, 2014, DOI: 10.1002/2014GL059774

14 May, 2014

Nature Climate Change paper on future global flood risk

Our research on future global flood risk is published on Nature Climate Change: article

-- Global flood risk under climate change

-- Yukiko Hirabayashi, Roobavannan Mahendran, Sujan Koirala, Lisako Konoshima, Dai Yamazaki, Satoshi Watanabe, Hyungjun Kim, & Shinjiro Kanae

abstract in NCC

-- Nature Climate Change, vol.3, pp816-821, 2013, DOI: 10.1038/nclimate1911

8 June, 2013

JSPS Ikushi Prize

I'm awarded the "JSPS Ikushi Prize" from the Japan Society for the Promotion of Science. It is a very big and honorable prize for outstanding Ph.D. students in Japan.

I really appreciate my friends support for my research activity and my everyday life! Thank you!

JSPS Ikushi Prize (English)

18 Jan, 2012

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