scholarly journals Study of The Carrying Capacity of The Environment Case Study: The Simanindo Area, Samosir Regency, North Sumatra

2021 ◽  
Vol 4 (1) ◽  
pp. 72-86
Author(s):  
Diki Surya Irawan ◽  
Deffi Ayu Puspito Sari ◽  
Rr. Alifianatifa Anandya Putriahalya
Keyword(s):  
Water Balance ◽  
Carrying Capacity ◽  
Fish Farming ◽  
Free Chlorine ◽  
Environmental Capacity ◽  
Organic Contamination ◽  
The Status ◽  
Net Cages ◽  
North Sumatra

Lake Toba area has been designated a National Strategic Area, which is a priority spatial planning area. The Simanindo Area is a sub-district in Samosir Regency which is an island in the middle of Lake Toba, North Sumatra, Indonesia. Lake Toba's current condition has been polluted by organic contamination and high free chlorine. In addition, the existence of fish farming activities or floating net cages that contribute to the contamination of phosphorus by 0.78 mg/l and free chlorine by 0.84 mg/l into Lake Toba which resulted in the need for studies on the carrying capacity and environmental capacity. Land carrying capacity can be calculated by comparing the availability of land with land requirements. While the carrying capacity of water can be calculated by comparing the availability of water with water requirements or using the Thornwaite Mather Water Balance method. Land Capacity can be calculated by the Land Endurance Unit. While the Capacity of Waters can be calculated by STORET analysis or calculation of domestic waste pollution load. The existence of a massive development plan for Simanindo area and rapid population growth is projected to cause the Land Support Capacity of the Simanindo Priority Zone to be conditionally safe in 2040. Water Carrying Capacity experienced a deficit in the atmosphere in July after being calculated with the Thornwaite Mather Water Balance. In addition, the Capacity of Water Bodies is also in the Status of Severe Pollution according to the STORET Method.

scholarly journals Analysis of Floating Net Cages on The Carrying Capacity of The Darma Reservoir

2021 ◽  
Vol 23 (1) ◽  
pp. 74-82
Author(s):  
Awliya Tribhuwana ◽  
Zaenal Muttaqin ◽  
Ohan Farhan
Keyword(s):  
Carrying Capacity ◽  
Fish Farming ◽  
Active Storage ◽  
Inundation Area ◽  
Sediment Deposits ◽  
Topographic Survey ◽  
Dead Storage ◽  
Base Elevation ◽  
Net Cages ◽  
Net Framework

Abstract. Darma Reservoir functions as a reservoir for irrigation, fisheries, and recreational and sports facilities. Currently, it only functions for irrigation and fish farming by floating net ponds. The development of floating net frameworks was so rapid that it conflicted with reservoir management. This study aims to determine the density of the floating net framework of the sedimentation conditions of the Darma Reservoir and to determine the development of the sedimentation rate of the Darma Reservoir in relation to the service life of the reservoir characterized by reduced dead storage. The first step was carried out by surveying the presence of the number of floating net cages, the distribution of the feed, the percentage of feed demand, the carrying capacity of the reservoir, then a topographic survey of the depth of the Darma reservoir to determine the capacity, rate and volume of sediment deposits. This study used quantitative approach, it began with distributing questionnaire forms and measuring the depth of the reservoir. The current condition of floating net cages is 4916 occupying 5.819% of the inundation area of 312.15 ha with an elevation of 712.50 m, while floating net cages are allowed according to the carrying capacity of Darma Reservoir waters amounting to 1,021. tons / harvest while the spawning pond is 3.483 tons/harvest. The volume of normal active storage for elevation 712.50 in 2020 is 28.086 million m3, while the volume of sediment deposits is 9.262 million m3 32.98%, the average sediment rate in the reservoir from 1988 to 2020 is 0.2894 million m3/year, while the sediment rate in catchment area Dam Dharma with an area of 23.5 km2 of 71.873 mm/year. Sedimentation in the Darma Reservoir has exceeded the limit of the base elevation of the reservoir, the elevation of the dead reservoir and the lowest elevation, but the reservoir is still functional. The planning life of the darma reservoir is up to 50 years, the suitability of the initial planning of operations in 1970 with operations until 2020.

scholarly journals Phosphorus load base carrying capacity estimation for fish culture in Lake Ranau in Indonesia

2021 ◽  
Vol 919 (1) ◽  
pp. 012020
Author(s):  
L Lukman ◽  
R Dina ◽  
A Ibrahim ◽  
A Waluyo
Keyword(s):  
Carrying Capacity ◽  
Limiting Factor ◽  
Fish Production ◽  
Phosphorus Load ◽  
Pollutant Load ◽  
Optimal Direction ◽  
The People ◽  
The Status ◽  
Surrounding Areas ◽  
Net Cages

Abstract Carrying capacity is the ability of waters to accommodate pollutant load inputs without reducing the water quality. For aquaculture in floating net cages (FNC), the carrying capacity is a criterion to achieve the maximum fish production based on the level of total phosphorus (TP) released from the activity, which is still acceptable according to utilisation purposes. Lake Ranau in Sumatra is essential in supporting the socio-economic needs of the people in the surrounding areas, including FNC activities. The development of FNC as an aquaculture model in open waters will have a positive value as long as it is within the limits of water carrying capacity. Thus, the carrying capacity of Lake Ranau waters needs to be estimated to provide optimal direction for FNC development in line with other activities such as tourism. The carrying capacity was estimated using the Beveridge (1987) formulation that has also been adopted into the Ministry Regulation of Environment number 28/2009. As a limiting factor for tourism purposes, the status trophic of waters should be oligotrophic or oligo-mesotrophic. Therefore, the fish production that can be achieved is between 0 tons/year (oligotrophic scale) to 1,662 tons/year (oligo-mesotrophic scale).

scholarly journals Influence of fish farming in net cages on phytoplankton structure: a case study in a subtropical Brazilian reservoir

2014 ◽  
Vol 74 (1) ◽  
pp. 145-155 ◽  
Author(s):  
ECR Bartozek ◽  
NC Bueno ◽  
LC Rodrigues
Keyword(s):  
Phytoplankton Community ◽  
Fish Farming ◽  
Phytoplankton Composition ◽  
Shannon Diversity ◽  
Phytoplankton Structure ◽  
Density Values ◽  
Net Cages

This study investigated the enrichment influence due to fish farming in net cages on the phytoplankton composition, density and diversity in two arms of a subtropical reservoir (Salto Caxias, Paraná). There were no statistically significant differences in the phytoplankton composition and diversity, as well as for concentrations of nutrients among the handled treatment. The density values were higher during the summer. Richness and Shannon diversity values were low during the study period. The equitability values were high during the winter and low in the summer. Variations of phytoplankton community and nutrients were mainly influenced by seasonality. The absence of significant differences between the treatments was probably due to the small number of net cages and fish used, as well as to the hydrodynamics of the studied environments, which are influenced by upstream rivers inflows.

scholarly journals The Carrying Capacity of Infrastructure and Spatial Planning to the Recovery of Pandan Beach Natural Tourism Due to the Covid-19 Pandemic in North Sumatra (Central Tapanuli Regency Case Study)

2021 ◽  
Vol 8 (4) ◽  
pp. 321-329
Author(s):  
Fernando Raja Partogi Sibagariang ◽  
Agus Purwoko
Keyword(s):  
Data Collection ◽  
Qualitative Methods ◽  
Carrying Capacity ◽  
Spatial Planning ◽  
Research Method ◽  
Large Scale ◽  
Spatial Arrangement ◽  
Tourism Attractions ◽  
North Sumatra

The purpose of this research is: (1) know the carrying capacity of infrastructure for the recovery and development of natural attractions on the pandan beach of Central Tapanuli Regency, (2) analyze the suitability of spatial arrangements in the Regency towards the recovery and development of natural attractions on pandan beaches of Central Tapanuli Regency, (3) analyze the priority of handling infrastructure and spatial arrangement policies for the acceleration of recovery and development of natural attractions on pandan beaches.  Central Tapanuli. The research method used is to use descriptive qualitative methods with case study models. Data collection techniques with interviews and documentation. The results of this study, that is (1) The carrying capacity of central Tapanuli Regency infrastructure to the recovery and development of natural attractions on pandan beach, already has infrastructure such as transportation, economy, health and social. (2) The suitability of spatial arrangements in the Regency to the recovery and development of natural attractions on pandan beach, namely when viewed from the distribution of facilities and infrastructure and the distribution of tourism attractions the most influential space functions due to the covid-19 pandemic are restaurants or restaurants and lodgings or hotels. (3) Priority of handling infrastructure and spatial arrangement policy for the acceleration of recovery and development of natural attractions on pandan beaches of Central Tapanuli Regency, namely the economy. Whether it's a small or medium-sized business or a large scale.

Varied Responses to Human-Induced Seismicity in the City of Azle, Texas

2019 ◽  
Vol 3 (1) ◽  
pp. 1-8
Author(s):  
Sarmistha R. Majumdar
Keyword(s):  
State Government ◽  
Induced Seismicity ◽  
Oil And Gas ◽  
The United States ◽  
The State ◽  
Prior History ◽  
Small Community ◽  
Regulatory Policies ◽  
The Status

Fracking has helped to usher in an era of energy abundance in the United States. This advanced drilling procedure has helped the nation to attain the status of the largest producer of crude oil and natural gas in the world, but some of its negative externalities, such as human-induced seismicity, can no longer be ignored. The occurrence of earthquakes in communities located at proximity to disposal wells with no prior history of seismicity has shocked residents and have caused damages to properties. It has evoked individuals’ resentment against the practice of injection of fracking’s wastewater under pressure into underground disposal wells. Though the oil and gas companies have denied the existence of a link between such a practice and earthquakes and the local and state governments have delayed their responses to the unforeseen seismic events, the issue has gained in prominence among researchers, affected community residents, and the media. This case study has offered a glimpse into the varied responses of stakeholders to human-induced seismicity in a small city in the state of Texas. It is evident from this case study that although individuals’ complaints and protests from a small community may not be successful in bringing about statewide changes in regulatory policies on disposal of fracking’s wastewater, they can add to the public pressure on the state government to do something to address the problem in a state that supports fracking.

EVALUASI PROGRAM/PROYEK PENGEMBANGAN KAWASAN EKONOMI KHUSUS SEI MANGKE DALAM RANGKA PELAKSANAAN KEBIJAKAN MP3EI 2011-2025 DI KORIDOR EKONOMI SUMATERA

2018 ◽  
Vol 6 (1) ◽  
Author(s):  
Firrean Firrean
Keyword(s):  
Local Government ◽  
Evaluation Process ◽  
Spatial Arrangement ◽  
Policy Program ◽  
Evaluative Research ◽  
Policy Optimization ◽  
Economic Zones ◽  
North Sumatra

Special Economic Zones (SEZ) is a region with certain limits within the jurisdiction of Indonesia which is set to perform economic functions and obtain certain facilities. One SEZ developed in North Sumatra Province and included in the National Strategic Area (KSN) Medan - Binjai - Deli Serdang - Karo is SEZ Sei Mangke. SEZ Sei Mangke is defined in PP 29 of 2012 on 27 February 2012 and is the first KEK in Indonesia which was inaugurated its operation by President Joko Widodo on January 27, 2015. KSN Mebidangro itself is an area of priority spatial arrangement because it has a very important influence nationally against state sovereignty, defense and state security, economic, social, cultural, and / or environment, including areas designated as world heritage. This research is an evaluative research intended to find out the end of a policy program in order to determine recommendation of last policy by using CIPO model which includes four stages: (1) context, (2) input, (3) process, and (4) output. The research method used is case study by applying qualitative research that aims to make an accurate interpretation of the characteristics of the object under study. Findings on the evaluation context indicate that the program is generally running well, but some aspects of synergy and policy optimization as well as financing support from central and local government need to be improved. In the input evaluation, and evaluation process some aspects need to be improved because the findings show the weakness of some aspects is the result of lack of synergy and optimization of policy and support from local government. Interesting from the evaluation of ouput is that with some weaknesses in the input and process components, it turns out the evaluation findings ouput show Seek Mangke SEZ development can still run well. The recommendation of this research is to improve the quality of policy synergy / program of SEZ Seek development by improving several aspects that are categorized in each stage of evaluation

scholarly journals Discursive Strategies and Sequenced Institutional Change: The Case of Marriage Equality in the United States

2021 ◽  
pp. 003232172110205
Author(s):  
Giulia Mariani ◽  
Tània Verge
Keyword(s):  
United States ◽  
Institutional Change ◽  
The United States ◽  
Marriage Equality ◽  
Agent Based ◽  
Discursive Strategies ◽  
Policy Debates ◽  
The Status ◽  
Private Actors

Building on historical and discursive institutionalism, this article examines the agent-based dynamics of gradual institutional change. Specifically, using marriage equality in the United States as a case study, we examine how actors’ ideational work enabled them to make use of the political and discursive opportunities afforded by multiple venues to legitimize the process of institutional change to take off sequentially through layering, displacement, and conversion. We also pay special attention to how the discursive strategies deployed by LGBT advocates, religious-conservative organizations and other private actors created new opportunities to influence policy debates and tip the scales to their preferred policy outcome. The sequential perspective adopted in this study allows problematizing traditional conceptualizations of which actors support or contest the status quo, as enduring oppositional dynamics lead them to perform both roles in subsequent phases of the institutional change process.

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