Learning from the past: common sense, traditional wisdom, and technology for flood risk reduction developed in Japan

Itsukushima, Rei; Ohtsuki, Kazuaki; Sato, Tatsuro

doi:10.1007/s10113-021-01820-z

Cited by 13 publications

(6 citation statements)

References 118 publications

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“…For the percentage of people engaged in primary industry, we used the values from Government Statistics ( https://www.e‐stat.go.jp/) and calculated the average value for each decade. The average of the inundated area for each decade was calculated from Itsukushima et al (2021), and the percentage for each decade is shown when the value for the 2010s is set as 100%. [Color figure can be viewed at wileyonlinelibrary.com]…”

Section: Discussionmentioning

confidence: 99%

“…The Japanese archipelago, the subject of this study, comprises many steep mountains, short, steep rivers, and exhibits flashy flow regimes (Yoshimura et al, 2005); however, the per capita water resource availability is only 48% of the world's average (Ministry of Land, Infrastructure, Transport and Tourism, 2022a, 2022b). In addition, 49% of the population is concentrated in 14% of the country's lowland area, and flood damage is extremely high (Itsukushima et al, 2021; Yoshimura et al, 2005), making dams essential facilities for water resource management and flood control. Furthermore, the degradation of biodiversity by dams is an issue (Fukushima et al, 2007; Hatano et al, 2005), as it is a biodiversity hotspot and an extremely diverse terrestrial water ecosystem (Itsukushima, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Historical development and the present status of Japanese dams

Itsukushima

2023

River Research & Apps

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Dams have contributed to population growth and technological innovation by reducing the risk of flooding and allowing humans to cultivate productive alluvial soils on river floodplains.However, in countries where many dams have already been constructed, many problems have been observed, such as river environment degradation, aging of the embankments, and inadequate dam performance. As the social and natural environment surrounding dams is becoming more complex and diverse, it is necessary to understand the current overall status of dams and the history of their construction such that we may consider how social capital and dams are related to human society and the natural environment. In this study, the relationship of basic information of dams and the social background in which the dams exist was examined for Japan, where dam construction began in earnest in the late 1800s and became a driving force for economic development. The situations surrounding dams are drastically changing, as maintenance and management costs increase due to the aging of dams and water demand varies due to changes in the industrial structure of a region. Simultaneously, there are instances where dams are expected to reduce damage, such as in the presence of more severe and frequent droughts and floods caused by climate change. It is therefore necessary to remove or restructure dams while considering numerous complex and diverse factors, such as the local social conditions, potential future changes, and environmental impact of rivers.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Historical development and the present status of Japanese dams

Itsukushima

2023

River Research & Apps

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“…The uplift of land also formed meandering rivers due to the rejuvenation of land. Because of its topography, various countermeasures are required for flood protection, resulting in a unique flood protection philosophy and technique in Japan's history [7]. In mountainous rivers, the substantial longitudinal variability of a channel's geometry is common with respect to longitudinal variations in rock resistance, glacial history, and hillslope stability [8].…”

Section: Characteristics Of Rivers In Japanmentioning

confidence: 99%

“…where z b denotes bed height and λ denotes porosity. The critical traction force for sand particles of each size can be calculated using Iwagaki's formula [63], as shown in Equation (7). (…”

Section: One-dimensional Modelmentioning

confidence: 99%

Spur Dike Applications for the Sustainability of Channels in Incised Steep Bend Streams

Ohtsuki,

Kono,

Arikawa

et al. 2024

Water

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Japan’s rivers are shaped by distinctive topography and abundant rainfall, and they face flooding and sediment supply escalation concerns under climate change. Small- and medium-sized rivers tend to catch unprecedented forces that exceed planned levels, leading to substantial widening and excavation. Thus, there is a demand for a method that is capable of managing significant flood flows over an extended period. The spur dike can maintain channel clearance by promoting erosion as well as providing bank protection. However, the effectiveness of this spur dike function has not been well studied in small- and medium-sized rivers and curved reaches. In this study, we evaluate the function of spur dikes in improving channel sustainability based on examples of small- and medium-sized rivers that have maintained their channel for more than ten years after spur dike installation. First, the applicability of the empirical rule was evaluated by comparing it with actual cases of erosion depths in curved sections in Japan. Next, one-dimensional simulations were performed to evaluate the sustainability of the section over a long period. Finally, a depth-averaged morphodynamic simulation, including the secondary flow effect, was applied to evaluate the location of the flow core and elevation changes due to the spur dike. The results showed that a slight difference in the ratio of river curvature radius to river width (r/B) caused the river channel to be erosive and sedimentary. The reasons for the difference were the cross-sectional expansion caused by the excavation of the bend and the difference in the plane flow regime caused by the shift of the flow core to the inside of the bend. Although it is structurally challenging to reproduce localized scour around a spur dike in a depth-averaged simulation, it is essential for designing to apply the simulation model and combine empirical knowledge.

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“…Local wisdom is one of the primary considerations in disaster management because residents are not only victims or objects of disaster but at the same time also play a role as subjects or actors in disaster management efforts who always try to adapt and take various ways that can be done to minimize disaster risk (Alexandra et al, 2019). Flood control systems are traditionally built with local resources, and continuous and stringent maintenance is required to maintain their function, enabling residents who are stakeholders to maintain and manage systems or facilities better because they have a high sense of ownership (Itsukushima et al, 2021).…”

Section: B 2 Nuwo Panggung Local Wisdom In Flood Disaster Managementmentioning

confidence: 99%

The Fuction of Nuwo Panggung in Flood Disaster Mitigation Kelumbaya District, Tanggamus

Budi,

Hardati,

Hayati

2023

jiip

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The culture of the Lampung Tribe dominates the culture in Kelumbayan District. As with other tribes in Indonesia, the Lampung tribe makes culture an identity that is attached to every member of the tribe. Local wisdom is part of the culture. Qualitative research is a process of understanding human or social phenomena by creating a comprehensive and complex picture that can be presented in words, reporting detailed views obtained from informant sources, and being carried out in natural settings. Instruments in the research were the observation of data collection, interviews, and documents. The local wisdom of nuwo onstage as a traditional house for the Lampung tribe in Kelumbayan District is still commonly found in Kelumbayan District, especially in Pekon Umbar, Napal, and Susuk. Various traditional Lampung houses are based on their shape, including the Slow Dalom Building, the Slow Pesagi, the Slow Kejayaan, the Slow Sakura, and the Slow Dalom. Nuwo Panggung in Kelumbayan District is included in the Lamban Pesagi, which has three building parts, namely the upper, middle, and lower sections. The Nuwo stage with the Lalan Pesagi type was built using a basic pattern of cylinders, cubes, and pyramids.

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Learning from the past: common sense, traditional wisdom, and technology for flood risk reduction developed in Japan

Cited by 13 publications

References 118 publications

Historical development and the present status of Japanese dams

Historical development and the present status of Japanese dams

Spur Dike Applications for the Sustainability of Channels in Incised Steep Bend Streams

The Fuction of Nuwo Panggung in Flood Disaster Mitigation Kelumbaya District, Tanggamus

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