A Study on a Reevaluation of the Old Apartment Complexes in Hanoi

Joint Research on Environmental Science and Technology for the Eart

The development and the use of lakes and marshes in Hanoi, Vietnam : Focusing on three major areas

Joint Research on Environmental Science and Technology for the Eart

CLASSIFYING SMALL AREAS IN HANOI FOR URBAN LANSCAPE MANAGEMENT-BASED ON FACTOR AND CLUSTER ANALYSIS METHOD

Joint Research on Environmental Science and Technology for the Eart

Geology of the Eoarchean, >3.95Ga, Nulliak supracrustal rocks in the Saglek Block, northern Labrador, Canada: the oldest geological evidence for plate tectonics

The Earth is a unique planet, which has been highly evolved, diversified and complicated through geologic time, and underwent many key events, including giant impact, magma ocean, core formation, large-scale mantle differentiation and late heavy bombardment, especially in its dawn. But, our knowledge of early Earth is limited due to the lack of the Hadean supracrustal rocks. The supracrustal rocks with the Eoarchean ages provide key evidence for the Earth's early evolution, but few supracrustal rocks have been comprehensively investigated. Therefore, we mapped in seven areas of the Saglek Block, northern Labrador, where ancient supracrustal sequences are interleaved with a diverse assemblage of orthogneisses. Early studies suggested that some of them have the Mesoarchean ages because of the lack of the Mesoarchean Saglek dyke, but we found the Saglek dykes in the areas to recognize the Eoarchean Nulliak supracrustal rocks and Uivak Gneiss in all the areas. Recent reassessment of U–Pb dating and cathodoluminescence observation of zircons from the oldest suites of the Uivak Gneiss showed that the Uivak Gneiss has the Eoarchean age, > 3.95 Ga, and forms the Iqaluk–Uivak Gneiss series. Because our geological survey clearly showed that the Iqaluk–Uivak Gneisses were intruded into the Nulliak supracrustal belts, the Nulliak supracrustal rocks are the oldest supracrustal rock in the world. The supracrustal belts consist of piles of fault-bounded blocks, which are composed of the ultramafic rocks, mafic rocks and sedimentary rocks in ascending order, similar to modern ocean plate stratigraphy (OPS). In addition, small-scale duplex structures are found over the areas. The presence of duplex structure and OPS indicates that the > 3.95 Ga Nulliak supracrustal belts originate from an accretionary complex. The presence of the accretionary complex, ophiolite and granitic continental crust provides the oldest evidence for the plate tectonics on the early Earth

Potential of traditional domestic rainwater harvesting systems: current trends and future directions

Although the potential of traditional domestic rainwater harvesting systems (RWHSs) is easily determined, objective knowledge is required to determine their sustainability or scientific validity. We aimed to broadly review recent trends and emerging opportunities for research on the potential of RWHSs in the global context. We reviewed three types of representative RWHSs: water cellars, stepwells, and qanats. In total, 16 potential categories were defined. First, to date, 50% of the categories of potential have been demonstrated but are not considered beneficial, have been proven only in limited locations, only in limited sampling sets, or are theoretical. Second, whether the involvement of other disciplines has resulted in an expansion of the research scope or whether a particular potential has not been comprehensively explained remains to be determined by researchers. Third, potential that has emerged in the 21st century is not beyond our imagination such as tourism potential and ecological potential. Therefore, researchers should actively explore and incorporate new innovative technologies with RWHSs to explore new potential. The findings of this study offer a viable research framework for investigating the evolution of the discipline and contribute to the development of critical thinking in the analysis of the potential of RWHSs

Long-Term Sustainability of Water Cellars in Traditional Chinese Villages: Factors Influencing Continuous Use and Effective Water Management Initiatives

Traditional rainwater harvesting systems have seen a shift of emphasis in recent years. While recognizing its social, economic and environmental contributions, sustainable use in a modern context can be vulnerable. Through a case study, this study focuses on the long-term sustainability of water cellars in traditional villages if reliable piped water is introduced. The aim is to discern the factors and renovation methods that influence residents’ willingness to continue using these water cellars. The results show that the overall willingness to use them is very low. However, regardless of their continued use or non-use, only a few residents would landfill them. Most residents were interested in their renovation, especially regarding simplifying rainwater harvesting methods. In addition, the management time for rainwater harvesting and heritage identity is positively correlated with the willingness for sustainable use; conversely, the identification of the environmental contribution has no positive correlation. Given these findings, we propose carrying out effective renovation that changes the rainwater catchment surface to roofs and increases residents’ awareness that water cellars can only be heritage if they are in use. By defining the long-term sustainability of a water cellar, this study shows how a quantitative approach focusing on heritage users can offer important insights into a constructive evolution rather than a destructive reconstruction under the influence of modernization. Finally, this study provides planners and water resource managers with effective, sustainable management practices for water cellars as well as similar systems in a historical context