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Geospatial Analysis and Turbidity Measurement for Monitoring Suspended Solid of Hitotsuse Dam in Miyazaki Prefecture, Kyushu, Japan Santosa, Purnama Budi; Mitani, Yasuhiro
Forum Geografi Vol 29, No 2 (2015): Forum Geografi
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar

The existence of suspended solids at Hitotsuse dam, Miyazaki Prefecture, Kyushu, Japan, has been the main concern of Kyushu Electric Power Company. These have been carried by rivers flowing into the dam. In a long term, it is worried that this phenomenon will potentially cause the environmental degradation, especially around the dam, where the Kyushu Electric Power Plant is located. Therefore, necessary measures are required to protect the dam from environmental degradation, which in return is to assure its long term power plant operational. Preliminary studies found that the suspended solid, which was generated upstreams and was carried out into the dam by rivers, causes the turbid water resident. Therefore, evaluation on the potential sources of the existence of the suspended solids needs to be carried out. In this research, analysis was conducted to understand the spatial distribution and the quantity of the suspended solid. For this purpose, by focusing attention on the upper river basin of reservoir, several factors which are possible to cause turbid water are extracted and analyzed quantitatively by using GIS. To understand the characteristic of the river turbidity, river flows and river turbidity are measured at several selected stations. Then mechanical factors causing turbid water are identified after analyzing relationship between efflux characteristics and possible factors of suspended solids. The results show that spatial information extraction could be done efficiently by applying spatial analysis method. Furthermore, by applying multiple regression analysis, it was found that landslide scars, artificial forests, drainage area, and terrain undulation are indicated as the dominant factors causing the turbidity.

GEOGRAPHIC INFORMATION SYSTEM (GIS) WEB SERVER FOR BIODIVERSITY INFORMATION SYSTEM DJAMALUDDIN, IBRAHIM; INDRAYANI, POPPY; MITANI, YASUHIRO; TAGANE, SHUICHIRO; YAHARA, TETSUKAZU
REINWARDTIA Vol 14, No 2 (2015): Vol.14 No.2
Publisher : Research Center for Biology

DJAMALUDDIN, I., INDRAYANI, P., MITANI, Y., TAGANE, S. & YAHARA, T. 2015. Geographic Information System (GIS) web server for biodiversity information system. Reinwardtia 14 (2): 249 - 258. - Ecological protection strategies, designed by sharing information and integrating data, play an important role in defining interconnections and interdependencies in research as well as in increasing global awareness. The Geographic Information System (GIS) web server is one technology solution to improve the interoperability and sharing between the biodiversity databases of an organization and the databases of other research groups. In this paper, a database system integration framework based on GIS technology and a GIS server system using the latest cloud-based technology have been developed to incorporate biodiversity databases in Asian region. A GIS server is a GIS web platform integrating multiple geodatabases and provides data display and query, allowing users to apply internet browsers to manipulate the functions and query the data, etc. To demonstrate the effectiveness of a GIS web server, plant biodiversity survey dataset of Mt. Gede Pangrango, West Java in Indonesia, was given as a case study for development and utilization of biodiversity information system in Asian region.

Geospatial Analysis and Turbidity Measurement for Monitoring Suspended Solid of Hitotsuse Dam in Miyazaki Prefecture, Kyushu, Japan Santosa, Purnama Budi; Mitani, Yasuhiro
Forum Geografi Vol 29, No 2 (2015): December 2015
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v29i2.991

The existence of suspended solids at Hitotsuse dam, Miyazaki Prefecture, Kyushu, Japan, has been the main concern of Kyushu Electric Power Company. These have been carried by rivers flowing into the dam. In a long term, it is worried that this phenomenon will potentially cause the environmental degradation, especially around the dam, where the Kyushu Electric Power Plant is located. Therefore, necessary measures are required to protect the dam from environmental degradation, which in return is to assure its long term power plant operational. Preliminary studies found that the suspended solid, which was generated upstreams and was carried out into the dam by rivers, causes the turbid water resident. Therefore, evaluation on the potential sources of the existence of the suspended solids needs to be carried out. In this research, analysis was conducted to understand the spatial distribution and the quantity of the suspended solid. For this purpose, by focusing attention on the upper river basin of reservoir, several factors which are possible to cause turbid water are extracted and analyzed quantitatively by using GIS. To understand the characteristic of the river turbidity, river flows and river turbidity are measured at several selected stations. Then mechanical factors causing turbid water are identified after analyzing relationship between efflux characteristics and possible factors of suspended solids. The results show that spatial information extraction could be done efficiently by applying spatial analysis method. Furthermore, by applying multiple regression analysis, it was found that landslide scars, artificial forests, drainage area, and terrain undulation are indicated as the dominant factors causing the turbidity.

GEOGRAPHIC INFORMATION SYSTEM-BASED EVALUATION OF THE ECOLOGICAL CONNECTIVITY INDEX MAP ACROSS PATCH SIZE SPECTRUMS: A CASE STUDY OF MAKASSAR CITY Djamaluddin, Ibrahim; Indrayani, Poppy; Makbul, Ritnawati; Mitani, Yasuhiro; Suwarno, Panji Nilo
INDONESIAN JOURNAL OF URBAN AND ENVIRONMENTAL TECHNOLOGY VOLUME 8, NUMBER 2, OCTOBER 2025
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/urbanenvirotech.v8i2.23072

Aims: This paper investigates the ecological functional areas of Makassar City by utilizing land cover spatial data from 1997 and 2012 to evaluate ecological connectivity through Geographic Information Systems (GIS). Methodology and results: A spatial analysis of these ecological functional areas was conducted across different patch size categories to assess the percentage distribution of each land-use type. Additionally, the comparative distribution of the Ecological Connectivity Index (ECI) map for Makassar City was simulated. The findings indicate a decline in connectivity levels in previously natural areas surrounding Makassar, particularly in the western and eastern regions of the city. The ECIs have significantly decreased from 1997 to 2012, primarily due to the impacts of urban development in low-density, dispersed suburban areas. The results suggest that optimal quantitative criteria for ecological functional areas at the city scale of Makassar can be classified within patch size spectrum III. Implementing well-designed strategies could help mitigate the loss of ecological connectivity, thereby supporting the protection and restoration of Makassar’s environmental integrity. Conclusion, Significance, and Impact of Study: from a landscape ecological perspective, a significant trend observed in Makassar City over the past fifteen years has been the rapid fragmentation and transformation of its natural landscape. This has led to the emergence of numerous habitat patches that are progressively smaller and more disconnected. A thorough understanding of the interactions between spatial patterns and ecological processes across various scales is essential for effective landscape and environmental studies.

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