This study analyzes flood runoff at the upper Kinu River Basin during Kanto-Tohoku torrential rainfall in September 2015. After 140 mm of initial rainfall, 20 mm/h of rainfall continued for more than 10 hours. Since the time of concentration of th...
京都大学防災研究所年報. A = Disaster Prevention Research Institute Annuals. A 59(0) 74-84 Jun 2016
Kanto-Tohoku heavy rainfall in September 2015 caused a severe flood disaster at the downstream of the Kinu River, a tributary of the Tone River. Overflow and the levee breech caused a widespread flood inundation with about 40 km2 in Joso city and ...
Recent studies in forest hydrology have reported the existence of mountainous grounwater in weatherd bedrock and its considerbly quick response to rainfall input. Furthermore, the dynamics of mountainous groundwater in the bedrock influences on sa...
The Chikusa River in Hyogo Prefecture suffered from extremely heavy rains by Typhoon Number 9 (Typhoon Etau) in 2009. In the Sayo-cho area, the inundated flood claimed more than 20 lives, many of whom were trying to evacuate from the inundated ris...
Thailand was hit by a great flood in 2011 resulting from irregular rainfall during the typhoon season that was estimated at 140% more than average. The flood began in the north and slowly moved to the central region, where it remained for more tha...
Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 69(1) 14-29 2013
An emergency response-type flood prediction was conducted for the devastating 2011 Thailand flood with a recently developed Rainfall-Runoff-Inundation (RRI) model. The prediction conducted in mid-October 2011, when the flood peak was just ap...
Hydrological Processes 26(6) 893-906 Mar 2012 [Refereed]
In a hydrological simulation using a complex model, equifinality is likely to occur in many different ways, due to various sources associated with the model structure, parameter as well as data uncertainties involved in modeling process. This stud...
Hydrological Processes 26(6) 855-871 Mar 2012 [Refereed]
This paper proposes a method to spatially lump a distributed rainfall-sediment-runoff model at the catchment scale. Based on a kinematic wave rainfall-sediment-runoff model, the proposed method spatially integrates (1) a rainfall-runoff model that...
Takahiro Sayama, Jeffrey J. Mcdonnell, Jeffrey J. Mcdonnell, Amod Dhakal, Kate Sullivan
Hydrological Processes 25(25) 3899-3908 Dec 2011 [Refereed]
Subsurface runoff dominates the hydrology of many steep humid regions, and yet the basic elements of water collection, storage, and discharge are still poorly understood at the watershed scale. Here, we use exceptionally dense rainfall and runoff ...
Takahiro Sayama, Go Ozawa, Takahiro Kawakami, Seishi Nabesaka, Kazuhiko Fukami
Hydrological Sciences Journal 57(2) 298-312 Feb 2012 [Refereed]
Pakistan has suffered a devastating flood disaster in 2010. In the Kabul River basin (92 605 km 2), large-scale riverine and flash floods caused destructive damage with more than 1100 casualties. This study analysed rainfall-runoff and inundation ...
Apip, T. Sayama, Y. Tachikawa, K. Takara, Y. Yamashiki
Journal of Flood Risk Management 3 270-284 Dec 2010
This paper presents a framework for assessing the contribution of different sources of parametric uncertainty in sediment runoff simulations. The proposed uncertainty assessment is comprised in the three procedures. First, global parametric sensit...
J. J. McDonnell, J. J. McDonnell, K. McGuire, P. Aggarwal, K. J. Beven, D. Biondi, G. Destouni, S. Dunn, A. James, J. Kirchner, P. Kraft, S. Lyon, P. Maloszewski, B. Newman, L. Pfister, A. Rinaldo, A. Rodhe, T. Sayama, J. Seibert, K. Solomon, C. Soulsby, M. Stewart, D. Tetzlaff, C. Tobin, P. Troch, M. Weiler, A. Western, A. Wörman, S. Wrede
Sunmin Kim, Yasuto Tachikawa, Takahiro Sayama, Kaoru Takara
Hydrological Processes 23(4) 597-611 Feb 2009 [Refereed]
A new attempt on ensemble flood forecasting is introduced by use of a radar image extrapolation along with a stochastic error field simulation, and a distributed hydrologic model. In contrast to the conventional ensemble simulation that uses initi...
Takahiro Sayama, Takahiro Sayama, Jeffrey J. McDonnell
Water Resources Research 45 Jul 2009 [Refereed]
Hydrograph source components and stream water residence time are fundamental behavioral descriptors of watersheds but, as yet, are poorly represented in most rainfall-runoff models. We present a new time-space accounting scheme (T-SAS) to simulate...
From Headwaters to the Ocean: Hydrological Changes and Watershed Management - Proceedings of the International Conference on Hydrological Changes and Management from Headwaters to the Ocean, HYDROCH 223-229 Dec 2009
The impact of climate change and human activity on hydrologic change can be evaluated only with a hydrologic model that is capable to simulate adequate sources, flowpaths and residence time of water, yet the capability for capturing these measures...
F. K. Barthold, T. Sayama, K. Schneider, L. Breuer, K. B. Vaché, H. G. Frede, J. J. McDonnell
Advances in Geosciences 18 3-8 Jun 2008
A major research challenge in ungauged basins is to quickly assess the dominant hydrological processes of watersheds. In this paper we present a top-down approach from first field reconnaissance to perceptual model development, model conceptualiza...
JOURNAL OF JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES 21(4) 296-313 2008
This study aims at evaluating the impact of climate change on flood disasters and dam reservoir operation in the Yodo River basin by feeding precipitation and evapotranspiration projection from Global Circulation Model (GCM) to a distributed hydro...
In the Asuwa River basin in Fukui Prefecture Japan, the largest-ever flood since hydrological observations began, occurred on 18 July 2004. The severe rainfall front in the middle of July brought a heavy rainfall of 265 mm in six hours. The urban ...
Journal of Japan Society for Natural Disaster Science 26(2) 189-201 Aug 2007
A real-time distributed runoff forecasting system is developed for the Yodo River basin (7, 281km^2). The system provides 6 hrs-ahead river discharge predictions every hour. The predictions include river discharges at 1, 707 points located about 3...
JOURNAL OF JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES 20(3) 214-225 May 2007
This paper proposes a hydrograph separation method based on spatiotemporal record of stream flow in a distributed rainfall-runoff model. It simulates spatiotemporal rainwater movement in a catchment, considering relationship between rainfall and r...
This paper presents hydrological predictions and flood safety assessment in a flow regulated basin with multi-purpose dams. A distributed rainfall-runoff prediction system is developed by incorporating a dam reservoir operation model into a physic...
This paper presents the development of a distributed rainfall-runoff prediction system considering flood control by dam reservoirs in the Yodo River basin. The simulation results show that the system can reproduce quantitatively flood control proc...
The Public Works Research Institute has been improving a runoff-inundation model, namely “RRI model.” This study verified the applicability of the RRI model for the Aganogawa River in Niigata prefecture, which was the first opportun...
京都大学防災研究所年報. B = Disaster Prevention Research Institute Annuals. B 52(0) 77-82 Jun 2009
Biwa-3D Model, consisted with Hydrodynamic components featuring non-hydrostatic solver with Semi-lagrangian grid scheme and ecological components for nutrients and phytoplankton solver has been integrated with distributed hydrological modeling sys...
As a data assimilation method of a distributed rainfall-runoff flood prediction system and river discharge observation data, this study proposes a filtering method of Muskingum Cunge river routing models. Application of the conventional Kalman fil...
京都大学防災研究所年報. C = Disaster Prevention Research Institute annuals. C 49(0) 155-162 Apr 2006
This paper analyzes the Yuragawa river flood by Typhoon No.23 on 19-22 October 2004 which brought the large number of casualties and loss of asset especially at the downstream region of the Yuragawa catchment. First, the discharge-hydrograph at Fu...
京都大学防災研究所年報. B = Disaster Prevention Research Institute annuals. B 48(0) 43-51 Apr 2005
This study tested the disaggregated rainfall field as the input field for hydrological simulation of various sub-catchments of the Yodo River. The multiplicative random cascade (RC) method (based on the beta lognormal model), the multiplicative ra...
Torrential rainfall frequently occurred resulted in flood disaster in recent years. To prevent flood disaster, we are developing flood forecasting system with leadtime of more than 12 hours. We utilize regional ensemble prediction system to accoun...
In this research, we have developed a model, Water and Energy Balance based Rainfall-Runoff-Inundation (WEB-RRI) model, by coupling the Simple Biosphere Model-2 (SiB2) with Rainfall-Runoff-Inundation (RRI) model which uses two-dimensional dif...
34th IAHR Congress 2011 - Balance and Uncertainty: Water in a Changing World, Incorporating the 33rd Hydrology and Water Resources Symposium and the 10th Conference on Hydraulics in Water Engineering 1 Jan 2011
