Indonesian Journal of Geography
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An Overview of Sky Brightness Surrounding Timau National Observatory (TNO), Indonesia
Full text linkThis study aims to analyze skylight conditions surrounding the newly constructed Timau National Observatory (TNO) in Kupang, Indonesia. The analysis was carried out with the primary reason of determining the initial conditions and surroundings of the area, thereby providing valuable information for future observers who will be using the facility. To achieve the stated aim, the sky brightness in the study area was measured in units of magnitudes per square arcsecond (mpsas) at a 20-kilometer radius. Furthermore, numerous observations were conducted at 32 distinct observation points using Sky Quality Meter (SQM) LU-DL (SQM-LU-DL), which was directed towards the zenith. The results obtained from these observations were subsequently analyzed using Surfer software with the primary aim of determining sky brightness in the study area. The analysis showed variations in sky quality in a 20 km radius, ranging from 21.64 to 20.37 magnitudes per square arcsecond (mpsas). The measurements showed that sky quality fell between the categories of great dark and semi-suburban transitional skies. However, it was important to comprehend that recent investigations had identified bright areas surrounding the observatory area, capable of diminishing the visual quality of sky if left unaddressed
Potential study of retention Ponds in the Samudra University environment to meet raw water needs and control floods
No full textThis study aims to evaluate the potential locations and volume capacities of retention ponds at Universitas Samudra (Unsam) to reduce flood discharge, provide raw water supply, and ensure water quality. The research supports the concept of a smart and green campus at Unsam. Water availability was calculated using the FJ Mock model, while water demand was projected based on the number of users. The retention pond capacity for flood control and raw water availability was assessed using the HEC HMS model. Water quality testing, including physical, chemical, and biological parameters, was conducted at the BTKLPP Class I Medan laboratory. The results indicate that the water demand at Unsam is 3 m³/day, which can be met by the reliable discharge of 16,344.93 m³/day. The existing reservoir retention pond, with a volume of 509,788.80 m³, contributes to flood discharge reduction; however, its water quality does not meet raw water standards, particularly due to high concentrations of Total Coliform and Escherichia Coli. Meanwhile, the Cotkala-Unsam retention pond can provide 103,596.96 m³ of water with quality that meets acceptable limits
Dynamic of Migration lifestyle and settlement of nomad in Bali, Indonesia
Full text linkThis research highlights the lifestyle of digital nomads, which is becoming a more common lifestyle in today's digital age. Bali is one of the most popular destinations for nomads. This research aims to explore the motivations of digital nomads in Bali. The research uses the case study research method by mapping several informants as research subjects. This article discusses the experiences of foreign tourists in Bali, particularly digital nomads, and the migratory lifestyle. It explores conversations and perspectives on Bali's attractiveness, working life, cultural interaction, and modern mobility. The findings show that the concept of 'nomad' is associated not only with high levels of mobility, but also with individuals who have chosen to settle in Bali due to finding the culture and lifestyle appealing. Modern mobility reflects the search for meaning in one's life experiences, which may include a search for stability and a depth of experience in one place. Furthermore, the discussion examines that the emergence of Bali's digital nomad community brings both economic benefits and challenges of overtourism on local communities
Sustainable Tourism Ecosystem In Strategic National Tourism Area (KSPN) Borobudur Yogyakarta and Prambanan (BYP)
Full text linkThis research aims to understand the tourism ecosystem as a complex phenomenon. The study attempts to design aspects that can advance the tourism sector, such as linkage, value chain, and interconnectivity systems. To maximize the tourism sector, the support of the BGCM (business, government, community, academic, and media) is needed to run as well as possible. Research conducted in Borobudur Yogyakarta Prambanan (BYP). This research uses the method of explorative descriptive research with a qualitative approach, aimed at studying objects naturally and in depth, where the researcher is the key instrument. The results of this study resulted in a road map of Sustainable Tourism Development relating to the application and issues of sustainable tourism with the optimization of the role of BGCM. BGCM has a role in creating tourism benefits that yield to the community and the environment in the National Strategic Tourism Area
Groundwater Vulnerability Comparison Using DRASTIC and GOD Methods in Surakarta City
Full text linkDemographic growth, urbanization, economic development, agriculture, and consumption per capita have increased the demand for water resources. The population density of Surakarta affects the city’s ability to fulfil its residents’ clean water requirements. As an urban region, Surakarta may be impacted by development activities that degrade the quality and quantity of groundwater. This growing demand should be balanced against effective management of water source regions. This research aims to investigate groundwater vulnerability in Surakarta City. We employed the DRASTIC and GOD methods and compared both results. These methods used the overlay and indexing approaches using GIS based on field data and secondary data such as drill, rainfall, and topographic data. The results of DRASTIC show three types of vulnerability: high (0.21%; 9.87 ha), moderate (94.22%; 4,355.98 ha), and low (5.56%; 257.25 ha), while GOD method results in high (7.03%; 324.96 ha), moderate (52.90%; 2,445.84 ha), low (38.69%; 1,788.81 ha), and negligible (1.37%; 63.49 ha). Based on both methods, we identified Banjarsari district as a location with high groundwater vulnerability. The correlation coefficient between the two methods is 0.511. This value shows that the correlation criteria are acceptable and comparable. This research can be used by local authorities and policymakers to manage groundwater resources.
State-of-the-Art Drought Handling in Indonesia
Full text linkDroughts tend to become more extreme, longer, and more frequent as an impact of climate change. Droughts now impact various development activities, especially those reliant on water resources, like agriculture for food security. Drought management issues in Indonesia stem from inadequate regulations and laws regarding drought response, due to intricate agency procedures and overlapping responsibilities. Nevertheless, there are currently established partial regulations and laws that govern the management of meteorological data and the accessibility of water resources. Without clear rules, policies, and frameworks, government policies on drought become less effective and overlapping. The research and novelty aim to design an integrated framework for handling drought by examining the present circumstances of relevant agencies using spatial nexus framework that is divided into three stages (construction, deconstruction, and reconstruction). During the first stage, the focus goes toward developing the construction framework will be proposed. The construction framework was conducted descriptively through a desk research method of drought management public policies, institutions, and operating systems for the agricultural sector in Indonesia. Moreover, a panel discussion was held to obtain the data and information about drought management by the government. Field observations were conducted to determine the handling of water resources practically for agriculture. Thus, drought management has been more concentrated on meteorological/climatological and hydrological elements. Moreover, it focuses on the statistical results of public and agricultural activities rather than on their socioeconomic consequences. A spatial approach will become the integration node of meteorological/hydrological elements, socioeconomic components, and agricultural activities
Environmental Degradation Analysis of Former Bengawan Solo River Lake Ecosystem
Full text linkThe ecosystem of the former river section lake in the research area formed by the straightening of the river and located in the Sub-Urban area, faces significant environmental degradation such as pollution, erosion, and water shrinkage that threaten its sustainability. The magnitude of environmental degradation that occurs needs to be studied because it can result in a reduction in clean water and shallowing of the lake. Compared with lakes such as Poyang Lake in China, which has experienced a decline in water quantity and quality due to seasonal fluctuations, climate change and waste, this study offers a similar perspective by highlighting the interaction of natural and human factors, and adds a new dimension related to degradation caused by erosion. This study uses a comprehensive approach, namely by combining image analysis, field measurements using measuring sticks, USV, geodetic GPS, laboratory analysis, and interviews. The results of the study indicate that the lake water quality status ranges from "moderately polluted" to "heavily polluted," while the groundwater quality varies from "meets quality standards" to "lightly polluted." The high water quality status is caused by human activities and land conditions, as well as the high rate of erosion around the lake reaching 289.63 tons/ha/year, with an average soil loss of 0.11 tons/year. In addition, the lake in the study area has shrunk by up to 72% due to seasonal fluctuations and climate change. Based on this, effective management is needed to maintain the ecological balance and environmental health of the former river section lake
ERRATUM TO: ASSESSMENT OF FLOOD RISK INDUCED BY LAND SUBSIDENCE USING MACHINE LEARNING
Full text linkCharacterizing Warm Temperature during April 2019 Monsoon Transition in the Central part of Java
No full textWarmer temperature than normal has been observed in the central part of Java Island-Indonesia during the monsoon transition in 2019. To explain the environmental process related to temperature variability, this research aims to characterize the process related to temperature anomaly and explain the contributing factors in terms of radiation balance and latent heat flux. This research uses the data from two meteorological stations from the Indonesian Bureau of Meteorology, Climatology, and Geophysics (BMKG) and the National Centers for Environmental Prediction (NCEP/NCAR) Reanalysis Project to explain the temperature anomaly. Several parameters, such as near-surface air temperature and humidity, cloudiness, solar and longwave radiation, as well as latent heat flux are obtained from the reanalysis data. This study focuses on descriptive time-series data analysis to explain the factors that contribute to the April 2019 temperatures. The results of this study show the effect of the Madden–Jullian Oscillation (MJO) on weather anomalies. The increase in humidity when the study area is traversed by the MJO causes an increase in humidity followed by intensive cloud formation and the release of latent heat in the cloud. The release of latent heat contributes significantly to the increase in temperature compared to the effect of the shortwave and longwave radiation balance. Thus, atmospheric phenomena in the tropics need to be studied further concerning warmer temperatures because they can be significantly affected by climate change
Decadal Remote Sensing Analysis of Seagrass Changes in Palu Bay, Central Sulawesi
Full text linkSeagrass meadows provide a variety of material, non-material and regulatory coastal ecosystem service; however, as the distribution of seagrass beds changes over time due to both anthropogenic activities and natural factors, it is important to monitor changes in seagrass condition. Seagrass meadows in Palu Bay are threatened by activities such as coastal development and land reclamation. Additionally, the bay was hit by a significant tsunami in 2018, which could have impacted ecosystems in the bay, including seagrass meadows. The aim of this study was to detect changes in seagrass extent and distribution over a 10-year period from 2012 to 2022 and changes in land use over approximately a decade (2010 and 2021) through the use of remote sensing technology. Changes in eagrass meadow areal extent were analyzed using data from a 2012 Landsat 7 Satellite Data Acquisition and a 2022 Landsat 8 Satellite Data Acquisition. Water column correction was implemented using the Lyzenga Algorithm. The results showed a significant decrease in the area of seagrass meadows around the coastal area of Palu Bay. Seagrass meadows in 2012 and 2022 covered 127.08 Ha and 87.79 Ha, respectively, indicating a decrease in extent of 43.29 Ha. As the accuracy of the satellite data classification results was 80%, the results are considered acceptable. Anthropogenic activities (mainly mining and construction related) are strongly suspected as the main drivers of this decline, while earthquake and tsunami events likely aggravated the degradation of coastal ecosystems in Palu Bay, including seagrass meadows