Makoto Taniguchi

Makoto Taniguchi
Research Institute for Humanity and Nature

PhD

About

342
Publications
81,293
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
11,963
Citations

Publications

Publications (342)
Article
Full-text available
Water, energy, and food are all essential components of human societies. Collectively, their respective resource systems are interconnected in what is called the “nexus”. There is growing consensus that a holistic understanding of the interdependencies and trade-offs between these sectors and other related systems is critical to solving many of the...
Article
Full-text available
Water, energy, and food are all essential components of human societies. Collectively, their respective resource systems are interconnected in what is called the “nexus”. There is growing consensus that a holistic understanding of the interdependencies and trade-offs between these sectors and other related systems is critical to solving many of the...
Article
The Earth’s climatic, ecological, and human systems are converging towards an existential crisis for global civilization within the lifetimes of children now living. Precursors of that crisis are already evident and likely to be further amplified as human population peaks around the end of the twenty-first century. A year ago, the statement from th...
Article
Sustainable Development Goals (SDGs) are the blueprints for achieving a sustainable future, and understanding the interlinkages among social, economic, and environmental fields is a key factor in accomplishing them. The goal of this study was to analyze a framework for sustainable economic growth considering the trade-offs among economic inequality...
Article
Full-text available
Submarine groundwater discharge (SGD), the direct discharge of groundwater to the sea, is a ubiquitous phenomenon worldwide. While SGD is defined as "any and all flow of water on continental margins", this review focuses on the terrestrial fraction, also known as fresh SGD Jakarta Bay, which started from the late 1980s have had greatest impact on m...
Article
Full-text available
External nutrient supply from the land and ocean is crucial for sustaining high primary productivity in coastal seas. Submarine groundwater discharge (SGD) is recognized as one of the most important sources of terrestrial nutrients. However, the relative importance of SGD-derived nutrients from different sources in coastal ecosystems controlled by...
Article
Repeated measurements of temperature–depth profiles were conducted in January 2017, June or November 2017, and February 2018 at 10 observation wells in the Kumamoto area, Japan, after the 2016 Mw7.0 Kumamoto earthquake to evaluate changes in post-earthquake subsurface temperature. These observation data were compared with pre-earthquake temperature...
Article
Repeated measurements of temperature–depth profiles were conducted in January 2017, June or November 2017, and February 2018 at 10 observation wells in the Kumamoto area, Japan, after the 2016 Mw7.0 Kumamoto earthquake to evaluate changes in post-earthquake subsurface temperature. These observation data were compared with pre-earthquake temperature...
Article
Full-text available
Through the global analysis of inundation disasters with regards to population and land elevation, we found that the largest number of people living in low-elevation land was in Asia. Population increase was also most rapid at these locations. Furthermore, through three case studies in Asia, we found that a critical land–water elevation difference...
Article
Full-text available
The number of studies concerning Submarine Groundwater Discharge (SGD) grew quickly as we entered the twenty-first century. Many hydrological and oceanographic processes that drive and influence SGD were identified and characterized during this period. These processes included tidal effects on SGD, water and solute fluxes, biogeochemical transforma...
Article
Full-text available
Submarine groundwater is richer in nutrients compared to surface (river) water and therefore has been considered to be an essential component of biological production in marine coastal ecosystems. However, there has been no information on the effects of submarine groundwater on animals at high-order trophic levels such as fishes. Here, we show the...
Article
Full-text available
The self-sufficiency ratio of rice in Tokyo was less than 5 % but the national self-sufficiency ratio in Japan has reached over 90 % in 2012. Accordingly, local rice distribution is a key factor for regional food security but also water resource management because a significant amount of irrigation water was simultaneously used or saved in the prod...
Article
The objective of this study is to characterize and quantify the “trans-spatial nexus synergy” benefit of subsidized water ponding in the water-energy-food nexus in Kumamoto, Japan. After years of decreased rice production in upstream areas and associated declines in groundwater levels, the Kumamoto city government implemented a subsidy program wher...
Article
Full-text available
The objective of this study is to characterize and quantify the “trans-spatial nexus synergy” benefit of subsidized water ponding in the water-energy-food nexus in Kumamoto, Japan. After years of decreased rice production in upstream areas and associated declines in groundwater levels, the Kumamoto city government implemented a subsidy program wher...
Article
Full-text available
Non-technical summary Most of the water humans consume is for agriculture. Rapidly increasing water demand has led to overexploitation of water resources in many important food-producing regions. In particular, growing groundwater-based irrigation causes potentially damaging depletion. Food systems are increasingly globalized, leading to large expo...
Article
Challenges for future hydrology were reviewed from the view points of interdisciplinary and transdisciplinary studies. Interdisciplinary studies on hydrology were categorized into 1) connections between adjunct disciplines because of seamless movement of water, and 2) integrated understanding of hydrology with different discipline. Transdisciplinar...
Article
Submarine groundwater discharge (SGD) was estimated on the Kamaiso Coast, a coastal zone at the base of Mt. Chokai, Yamagata, using a continuous heat-type automated seepage meter and Lee-type seepage meter. Significant SGD was observed and it changed with tidal cycle; the SGD flux reached a maximum value of 200 cm/day. The contribution of fresh gro...
Article
Full-text available
Submarine groundwater discharge (SGD) consists of fresh submarine groundwater discharge (FSGD) and recirculated submarine groundwater discharge (RSGD). In this study, we conducted simultaneous 25-hour time-series measurements of short-lived 222Rn and 224Ra activities at two sites with differing SGD rates in the central Seto Inland Sea of Japan to e...
Article
Full-text available
Groundwater is used in Obama City, Japan, to melt snow (~13% of total groundwater use) during the winter, the remainder being used for mostly domestic purposes, such as drinking water. Due to concern about the impacts of this snow-melting practice on nearshore marine resources, we estimate the benefits and costs of increasing the volume of the grou...
Article
Full-text available
The aim of this study is to assess the impact of rice-based food security on water, energy, land, and CO2 emissions from a holistic point of view using the Nexus approach, which analyzes tradeoffs between water, energy, and food management. In Japan, both rice consumption and the area harvested for rice have decreased. Maintaining a high self-suffi...
Article
In order to evaluate the potential benefit and negative impacts of urbanization on the water-energy-food nexus, analyses have been made in Asia-Pacific countries with production-consumption relationships of water-energy-food nexus. Negative correlations have been found between urbanization rates and energy consumption rates for water and food produ...
Chapter
Although a major potential contributor to water and nutrient budgets, lacustrine groundwater discharge (LGD) is often neglected in most lake studies. Through electrical resistivity profiling surveys, the authors examined the possible occurrence of LGD in southern Laguna de Bay, the largest freshwater lake in the Philippines. Discrete and dispersed...
Article
Full-text available
High-resolution mapping along the coast and time-series measurements of the radon-222 (222Rn) concentrations in the shallow zone in a semi-enclosed sea, Obama Bay, Japan, were undertaken in 2013. The temporal and spatial variations in the 222Rn concentrations were analyzed in parallel with meteorological conditions, physical–biogeochemical characte...
Article
Full-text available
Water, energy, and food are among the most important and fundamental resources for human beings and society. Despite the large potential for efficiency and reduction of losses, the demand for these resources is likely to increase due to population growth, changes in lifestyles, climate change, and other aspect of global change. The strong interconn...
Article
Full-text available
Nutrients supplied from submarine groundwater discharge (SGD) are generally thought to enhance primary production in coastal seas. However, there is little evidence for a direct association between SGD and phytoplankton primary productivity. To elucidate the response of in situ primary productivity to SGD, we conducted comparative experiments at th...
Article
Submarine groundwater discharge (SGD) is defined as all direct discharge of subsurface fluids into coastal zone. Components of SGD consist of fresh submarine groundwater discharge and the recirculated saline seawater discharge. SGD could act as a pathway for the transport of anthropogenic contaminants and nutrients to coastal waters. Measurement SG...
Article
Full-text available
Ever since the contemporary view of the concept of human security has expanded from a state level to an individual level, it has been tied to a normative measurement of risk from perennial and pervasive threats that affect the vital core of human values. The vital core comprises an individual’s set of functions for development relative to condition...
Article
Disaster management problems often pose the same types of challenges that environmental governance problems do; they involve decision-makers at various levels and can transcend political boundaries. We conduct a benefit-cost analysis of a disaster adaptation strategy in Otsuchi, which was undertaken shortly after the 2011 Tohoku earthquake and tsun...
Article
Full-text available
In a coastal zone discharging submarine groundwater, we observed sea surface temperature using a drone equipping infrared thermography in order to verify the availability and defect on exploration of submarine groundwater using a drone. The difference of temperature between sea surface above the discharge point of submarine ground water and surroun...
Article
Full-text available
Study region: We do not target particular region, but we implement the workshop experiments towards the researcher groups in the laboratories. Study focus: When we discuss hydrology in the context of water–energy–food nexus, the discussion will inevitably include interdisciplinary contents. For example, in the impact assessment of groundwater use w...
Chapter
To investigate the cause of land subsidence occurring in Jakarta, Indonesia, we have conducted absolute gravity measurements near or at the existing GPS points in 2008, 2009, 2010, 2011 and 2013, by using a portable absolute gravimeter Micro-G LaCoste A10 serial number 017 (MGL A10-017). The A10 measurements, particularly those conducted before 201...
Article
Full-text available
Study region: We investigated in Beppu, Oita Prefecture, Japan. Hot spring drainage flows into a river and then flows into coastal areas in this area, a region in Japan with many hot springs. Study focus: The effects of that drainage on river and coastal area ecosystems remain unclear. We evaluated the impact of the hot spring drainage on fish comm...
Article
Full-text available
Study region: The Coastal California basin aquifer system (CCB), USA. Study focus: Understanding the controls on nonpoint source (NPS) nitrate (NO3−) contamination in groundwater is motivated by the widespread detection of NO3−, implications for human health and aquatic ecosystems, groundwater sustainability, and a growing realization that such und...
Article
Full-text available
Study region: Calamba and Los Baños in Laguna Province, Philippines lie between the northern part of Mt. Makiling and north shore of Laguna de Bay. Study focus: One significant activity in Laguna province is the development of the water resorts which includes hot springs resorts and spas. Presence of hot springs is due to the geothermal activities...
Article
Full-text available
Security measures of three resources; water, energy and food are analyzed for thirty two countries in the Asia Pacific region which are faced to Pacific Ocean, in terms of amounts of the resource, self-production, and diversity of sources of each resource. Diversity for all the three resources is also analyzed using surface water and groundwater fo...
Article
Full-text available
Study focus: There have been far more studies on how the variability in surface water discharge affects production of animal communities in aquatic ecosystems while less information has been accumulated on the mechanisms of how the groundwater supply works. Study region: Physical and biological surveys were conducted to test the hypothesis that hig...
Article
Full-text available
Study region: Obama City has a population of 33,000 and is located in the central Wakasa district, in southwest Fukui Prefecture, Japan. Obama’s groundwater resources are supported by the Kitagawa (38 km2) and Miniamigawa (17 km2) river basins. Groundwater is used aboveground year round for commercial and domestic purposes and during winter months...
Article
Full-text available
Study region: This study explores the connectivity of upland farmers and downstream fishers through interlinkages of water, energy and food within the Dampalit sub-watershed of Laguna Lake, Philippines. Study focus: The aim of the study is to yield policy relevant results to improve the status of the water resources and food products and to reduce...
Research
Full-text available
This paper focuses on a collection of methods that can be used to analyze the water-energy-food (WEF) nexus. We classify these methods as qualitative or quantitative for interdisciplinary and transdisciplinary research approaches. The methods for interdisciplinary research approaches can be used to unify a collection of related variables, visualize...
Conference Paper
Full-text available
The Citarum basin was selected for the case of Indonesia study site of RIHN Water-energy-food Nexus Project with focus on the Juanda/Jatiluhur dam as the downstream of the three large cascaded reservoirs. We define human-environmental sustainability as the joint optimization between human and environmental security as well as the water-energy and w...
Article
Full-text available
This paper focuses on a collection of methods that can be used to analyze the water-energy-food (WEF) nexus. We classify these methods as qualitative or quantitative for interdisciplinary and transdisciplinary research approaches. The methods for interdisciplinary research approaches can be used to unify a collection of related variables, visualize...
Article
Full-text available
This study identifies the stakeholders and their interests and clarifies the potential disputes to examine sustainable use of groundwater by stakeholder analysis in Obama which depends on groundwater as major source of water. The results demonstrate as follows. Firstly, there are gaps among stakeholders in terms of prerequisite knowledge. Therefore...
Conference Paper
Full-text available
Japan sustained catastrophic damage from The Great East Japan Earthquake and its consequent tsunami on March 11, 2011. Those events caused economic losses estimated at more than 210 billion US dollars. Moreover, the disasters demonstrated the threat of natural disasters to other nations. Local governments affected by the earthquake depended on assi...
Article
We carried out a seasonal study of fresh submarine groundwater discharge (SGD) and associated nutrient fluxes in a semi-enclosed bay along a tideless coastal zone using a 222Rn and salinity mass balance model for a whole bay scale. The resulting SGD rates showed large intra-annual variability from 0.05 × 106 to 0.77 × 106 m3 day−1, which were contr...
Conference Paper
Full-text available
Time-lapse gravity monitoring is a way to assist in building up knowledge of the changes of subsurface condition. Gravity monitoring techniques have been applied to the investigation of dynamic processes in various types of geothermal and volcanic fields. Gravity changes enable the characterization of subsurface processes: i.e., the mass of the int...
Article
Full-text available
Multi-scale evaluations of submarine groundwater discharge (SGD) have been made in Saijo, Ehime Prefecture, Shikoku Island, Japan, by using seepage meters for point scale, 222Rn tracer for point and coastal scales, and a numerical groundwater model (SEAWAT) for coastal and basin scales. Daily basis temporal changes in SGD are evaluated by continuou...