Yuichi S. Hayakawa

<p>We have been conducting a project on the "Development of Open-Access e-Learning Materials for GIS Education Based on the Existing Core Curriculum and the Body of Knowledge." This project aims to develop and publish online GIS materials for GIS ...

© 2018, The Author(s). We conducted topographic measurements using unmanned aerial vehicles and by terrestrial laser scanning at inaccessible sea cliffs with an overhanging complex shape in eastern Japan. From the repeated measurements, we constru...

© 2018, The Author(s). Unmanned aerial systems (UASs) and structure-from-motion multi-view stereo (SfM-MVS) photogrammetry have attracted a tremendous amount of interest for use in the creation of high-definition topographic data for geoscientific...

© 2018 Author(s). The number of scientific studies that consider possible applications of remotely piloted aircraft systems (RPASs) for the management of natural hazards effects and the identification of occurred damages strongly increased in the ...

© 2018 Author(s). Debris avalanches caused by volcano sector collapse often form characteristic depositional landforms such as hummocks. Sedimentological and geomorphological analyses of debris avalanche deposits (DADs) are crucial to clarify the ...

<p>The encouragement of geographical thinking by inspiring "geographical imagination," i.e., an expanded vision of spatial phenomena, can be a useful approach for the outreach of geography. We developed a method to visualize spatial phenomena usin...

© 2017 Institute of Australian Geographers To assess the geomorphological importance of waterfall recession in volcanic bedrock, we examined recession rates of six waterfalls in the lower reaches of Kaminokawa river basin on the Osumi Peninsula in...

© 2017 T. Zahra et al. Extraction of knickpoints or knickzones from a Digital Elevation Model (DEM) has gained immense significance owing to the increasing implications of knickzones on landform development. However, existing methods for knickzone...

© 2017 Elsevier B.V. Debris sourced from landslides will result in environmental problems such as increased sediment discharge in rivers. This study analyzed the sediment discharge of 17 main rivers in Taiwan during 14 typhoon events, selected fro...

© 2017 Gebrüder Borntraeger Verlagsbuchhandlung, Stuttgart, Germany. Hummocky landforms are often observed on the surface of debris avalanche deposits induced by catastrophic rockslide or sector collapse of volcanic mountains, and the quantitative...

In the last few years, small unmanned aerial vehicles (UAVs) and structure-from-motion multi-view stereo (SfM-MVS) photogrammetry have attracted a tremendous amount of interest for the creation of high- definition topographic data. This study dete...

© 2016, © Emerald Group Publishing Limited. Purpose – The purpose of this paper is to present a concurrent implementation of sustainable inventory for the UNESCO World Heritage sites of Bat, Al-Khutm and Al-Ayn in the interior of Oman. Design/meth...

&emsp;With the spread of small unmanned aerial vehicle (UAV) equipped with a digital camera (UAS: unmanned aerial system), it has been facilitated to acquire multi-view aerial images. Whereas, the technique of Structure-from-Motion Multi-View Ster...

&emsp;High-resolution landform data have become widely available in parallel with the technical revolution in topographic measurements, particularly those related to laser scanning technology. Aerial laser scanning (ALS) has become popular for tak...

© Antiquity Publications Ltd, 2015. An unexpected new source of tin was recently located at Hisarclk, in the foothills of the Mount Erciyes volcano in the Kayseri Plain, close to the Bronze Age town of Kültepe, ancient Kanesh and home to a colony ...

Landslides are one of the most destructive geological disasters affecting Japan every year, resulting in huge losses in life and property. Numerous susceptibility studies have been conducted to minimize the risk of landslides; however, most of the...

&emsp;This study examines the characteristics of landforms affected by the 2011 tsunami along the rocky coasts of the Sanriku area in northeastern Japan. We use terrestrial laser scanning to take detailed topographic measurements of slopes near th...

© 2014, Springer Science+Business Media Dordrecht. The 2011 Tohoku-oki Tsunami affected approximately 600 km of the northeastern coast of the Japanese Honshu Island, leaving traces of destruction on man-made buildings and depositing mud- to boulde...

In the last few years, SfM (Structure from Motion) based on photographs taken from UAV (Unmanned Aerial Vehicle) has attracted a tremendous amount of interest for the creation of DSM (Digital Surface Model) and other morphometric products. However...

Recession rates of four waterfalls formed by the surface deformation of the Chelungpu Fault at the time of Chi-Chi Earthquake on September 21, 1999 in central Taiwan were measured in the field and assessed with an empirical model of waterfall eros...

Pedestal heights of reef limestone on the coastal terrace in Kikai Island are reexamined with regard to the depth of surrounding sand layer. An old photograph (Shibusawa Film) taken in 1936 suggests that the pedestals on the terrace II surface wer...

Combined use of LRF (laser range finder) and DGPS (differential global positioning system) enables quick and cost-effective acquisition of detailed topographic data in field sites (Hayakawa and Tsumura, 2008, Transactions, Japanese Geomorphologica...

Recession of waterfalls is a significant agent in bedrock river erosion and development, but field data on waterfall recession rates have been limited due mainly to the lack of information on initiation age and recession distance of waterfalls. Th...

A topographic dataset, including topographic map and digital elevation model (DEM), is fundamental for various kinds of field-based sciences including geomorphology, geology and archaeology. However, to make a detailed topographic map by tradition...

Recession rates of two waterfalls, Ayugaeri Falls and Sugaru Falls, which are associated with the gorge formation of in the Tateno Canyon in the western part of the Aso caldera, are examined on the basis of the empirical equation after Hayakawa an...

The mean recession rate of Kegon Falls is examined, estimating original location and age. Two locations (L_I and L_II) at which the waterfall originated are estimated based on the distribution of Kegon lava, while the age of or...