Kedung Ombo Research Articles

The Occurrences of Harmful Algal Blooms (HABs) Species and Trophic Status Update in Kedung Ombo Reservoir

Graphical Abstract Highlight Research Water quality conditions in Kedung Ombo Reservoir. Phytoplankton species and their abundance in Kedung Ombo. Potential existence and dominance of HABs species. The updated trophic status is mapped based on the TSI, Secchi depth, chlorophyll-a, and total phosphorus. Abstract Anthropogenic inputs affect the quality of freshwater ecosystems which causes ecological and health problems to aquatic ecosystems. Harmful algal blooms (HABs) associated with cyanotoxins often occur in nutrient-rich or eutrophic freshwater ecosystems. Kedung Ombo Reservoir in Indonesia has been previously classified as eutrophic to hypertrophic. Therefore, this study aimed to identify the occurrences of potential HABs species, measure the bio-physico-chemical water quality parameters, and update the trophic status of Kedung Ombo Reservoir. Sampling was done thrice during the dry season in 2022 from 5 stations. Twenty-two species of phytoplankton were observed in Kedung Ombo Reservoir. Anabaenopsis sp., Aphanizomenon sp., Ceratium sp., Mougeotia sp., Pandorina sp., and Ulothrix sp. were identified as potentially harmful species. Among those, the potentially HABs species, Aphanizomenon sp. was the most abundant (179,344 cells/L) and Cyanophyceae (205,539 cells/L) was the dominant group of phytoplankton. Kedung Ombo Reservoir had a water temperature of 29.49±0.41°C, phosphate of 0.27±0.25 mg/L, and alkaline pH of 7.90±0.39. Kedung Ombo Reservoir also had low transparency coupled with low dissolved oxygen concentration. The occurrences of HABs species were correlated with transparency and dissolved inorganic nutrients, especially phosphate concentrations. Kedung Ombo Reservoir showed eutrophic conditions based on Secchi depth, chlorophyll-a, total phosphorus, and TSI. Based on research findings, control and mitigation efforts are needed to overcome the eutrophication problems which disrupt the balance of the aquatic ecosystem in the Kedung Ombo Reservoir.

Predicting and determining antecedent factors of tourist village development using naive bayes and tree algorithm

This study aims to predict the progress status of tourism villages in the Kedung Ombo area, Java, Indonesia, and find the antecedent factors of the progress of tourism villages in Indonesia. This study uses a modern approach, namely data mining. Data sources for tourist villages use the data available on the Google link and the observation method. The prediction technique uses the Naïve Bayes machine learning algorithm and Tree Decision on Orange 3.3.0 software. The number of tourist villages analyzed was 126. The results showed that all tourist villages in the Kedung Ombo area were at the development level of the four tourist village classifications of the Ministry of Tourism and Creative Economy. The antecedent factors for the progress of tourism villages are the completeness of ICT facilities, multi-stakeholder partnerships, strong government support, community involvement, and various attractions. Another finding is that the Tree Decision algorithm provides better predictions than the Naïve Bayes method. The results of this study can be used to design policies for developing tourist villages throughout Indonesia.

PENGARUH CITRA DESTINASI TERHADAP MINAT BERKUNJUNG KEMBALI KE OBYEK WISATA WADUK KEDUNG OMBO

This study researches the effect of destination image on the interest in revisiting the Kedung Ombo Reservoir tourist attraction using a quantitative approach. Data collection in this study was carried out using a questionnaire questionnaire distributed online to visitors to the tourist attraction. The sample size of this study was 100 respondents, and data processing was conducted using IBM SPSS Statistics software version 21. The t-test analysis showed that partly cognitive and partly conative factors had a positive and significant effect on revisit interest, while Affective had a significant but weak effect. The implication of this study is that destination managers should prioritise improving cognitive and conative factors to increase visitors' interest in returning to Kedung Ombo Reservoir. The novelty of this study lies in its empirical findings, which contribute to the destination management literature regarding the influence of destination image on return visit interest.

PENGARUH RENCANA PENINGKATAN VOLUME TAMPUNGAN TERHADAP STABILITAS TUBUH BENDUNGAN KEDUNG OMBO

The strategy to meet the water demands of Semarang and Demak Regencies involves enhancing the storage capacity of the Kedung Ombo Dam. This augmentation will inevitably alter the typical water level, thereby affecting the stability of the dam structure as it bears a greater load. Furthermore, the Kedung Ombo Dam, which is nearly 32 years old, necessitates re-evaluation since it lacks the full benefit of contemporary design methods. This study is confined to examining the slope stability, both static and pseudostatic, at a steady state flow, with the highest normal water level elevation (elevation +92.00) as the focal point. The slope stability analysis was conducted via the finite element method using the Slope/W in Geo-Studio software. The outcome of the static slope stability analysis indicates that the safety factor of the Kedung Ombo Dam body remains above the minimum allowable safety factor. In the pseudostatic analysis, the safety factor during the Operating Basic Earthquake (OBE) remains above the minimum allowable safety factor. However, during the Maximum Design Earthquake (MDE), the safety factor demonstrates a value that is lower than the minimum allowable safety factor. Nevertheless, the analysis of fixed displacement or permanent deformation reveals that the maximum settlement that occurs during the MDE earthquake does not exceed 50% of the available freeboard.

Cichlasoma urophthalmus (Günther 1862): discovery of alien predator fish in Kedung Ombo Reservoir, Central Java, Indonesia

The entry of alien predatory fish in Indonesian waters has a negative impact on local ecosystems in Indonesia, foreign predatory fish can spread disease, become main predators and can cause imbalance in the food chain. From this study, we report the presence of alien predatory fish of the type Cichlasoma urophthalmus (Günther 1862) or Mayan Cichlid from tropical waters of North America caught in Kedung Ombo Reservoir, Grobokan Regency, Central Java. The species identification method uses a morphological observation approach based on Miller et al. (2005) and Nico et al. (2007). This finding is the first for the type of Cichlasoma urophthalmus recorded in the Kedung Ombo Reservoir. A description of the morphology of the caught species Cichlasoma urophthalmus is included in the discussion.Keywords: Alien Predatory Fish; Kedung Ombo Reservoir; Mayan Cichlid; Cichlasoma urophthalmus

Cichlasoma urophthalmus (Günther 1862): discovery of alien predator fish in Kedung Ombo Reservoir, Central Java, Indonesia

The entry of alien predatory fish in Indonesian waters has a negative impact on local ecosystems in Indonesia, foreign predatory fish can spread disease, become main predators and can cause imbalance in the food chain. From this study, we report the presence of alien predatory fish of the type Cichlasoma urophthalmus (Günther 1862) or Mayan Cichlid from tropical waters of North America caught in Kedung Ombo Reservoir, Grobokan Regency, Central Java. This finding is the first for the type of Cichlasoma urophthalmus recorded in the Kedung Ombo Reservoir. A description of the morphology of the caught species Cichlasoma urophthalmus is included in the discussion.Keywords: Cichlasoma urophthalmus, Mayan Cichlid, Alien Predatory Fish, Kedung Ombo Reservoir

Implementation of Reuse and Recycle Models as an Effort to Fulfill Fish Feed for Fisherman’s Cage in Kedung Ombo

The purpose of this service is the development of the fishery sector by utilizing the remaining production (reuse and recycle) as an effort to preserve the environment and increase the circular economy. These objectives are derived in specific objectives: 1) Development of processed fish food to fulfill the needs of independent fish feed; and 2) Making fish feed based on local potential and recycling fish processing residue. The service uses training and mentoring methods. The training is expected to provide skills to the community, especially in the manufacture of fish feed made from leftovers. The training was continued with mentoring by involving elements of students on an ongoing basis. Another method used is Focus Group Discussion (FGD). The result of this service is the growing independence of aquaculture fishermen and empowerment in improving their welfare.

Pathways toward the Transformation of Sustainable Rural Tourism Management in Central Java, Indonesia

Managing sustainable rural tourism requires a strategic transformation adapted to local conditions, the complexity of rural institutions, and the dynamics of future changes. In addition, it must be inclusive. This paper presents transformation pathways toward sustainable rural tourism management in developing countries. The general objective is to develop sustainable development strategies in the context of rural tourism. The specific objectives are to develop policy pathways and the best scenarios in this context. The study was conducted in the Kedung Ombo area in Central Java, Indonesia: a representative area involving several districts and other public organizations as stakeholders. Data analysis was performed using the MULTIPOL method. The results show that an integrated development policy that considers the interests of all stakeholders, the potential of rural resources, the infrastructure, and human resources capacity would be the optimal policy. Priority programs to be implemented are infrastructure development, strengthening private investment, strengthening governance, developing amenities, and developing information and communication technology. Furthermore, the “flight of the flamingos” and “leapfrogging” scenarios can be considered to achieve future tourism growth goals and objectives. This study is an essential resource for authorities in determining rural tourism development policies in the research location and can be applied in other areas with similar characteristics.

Predicting determinant factors and development strategy for tourist villages

Tourist village program is one development priority program for rural development. Despite numerous opportunities to develop tourist villages such as the availability of natural resources and high demand for tourist villages recently, some challenges are still faced to develop tourist villages, especially in a developing country such as Indonesia. Governance problems, infrastructure, and effective partnership are among other factors that remain challenging in developing tourist villages. This study attempts to identify factors that determine the state of tourist villages in Indonesia and determine the appropriate strategies for better tourist village development. Using the case of tourist villages in Kedung Ombo, Central Java, a water based attractive tourist village, this study uses both machine learning and multicriteria approaches by means of Promethee in order to address the objective of the study. This study shows that government support, application of information technology, infrastructure, local participation, partnership, and attractive variations, are among the determinant factors that affect tourist village development. The study also reveals that the appropriate strategies for tourist village development include, improving infrastructure, institutional strengthening, and capacity building. This study could be used to assist local national as well as sub-national governments to effectively manage tourist villages in Indonesia.

PENGEMBANGAN DIGITAL MARKETING WISATA BOYOLAYAR-KEDUNG OMBO PADA MASA PANDEMI COVID-19

Boyolayar Tourism is one of the tourist destinations in the Kedung Ombo reservoir area, which was forced to close due to the Covid 19 pandemic. The implementation of PPKM has resulted in no visitors to this tourist destination, resulting in abandoned locations and tourist rides and declining popularity. Therefore, intensive promotion is needed to help restore the popularity of Boyolayar tourism and encourage tourists to come. This PKM activity aims to help tourist destination managers re-strengthen Boyolayar's tourist attractions through the development of digital promotional media. Activities carried out to include 1. counseling on digital marketing for tourism; 2. training on account creation and social media content management, and 3. development of the Boyolayar tourist village website. The methods used are lecture, discussion, and practice. The activity was followed by the manager of the Boyolayar tourist village and carried out in one of the Boyolayar tourist spots for six days. The activity has resulted in 1. understanding of the management of the Boyolayar tourism village about the importance of digital-based marketing and promotion; 2. the formation of interesting and informative Facebook and Instagram social media accounts; and 3. the establishment of the Boyolayar website.

POTENSI KERAGAMAN IKAN DI WADUK KEDUNG OMBO SEBAGAI PENYEDIA KEBUTUHAN PANGAN BERKELANJUTAN

The program to build food security can be applied to several aspect such as food safety, food availability, affordability, and food distribution. The program is carried out so that humans can manage natural resources for the availability of food needs in a sustainable manner. One of the most important foods is fish. Fish contains high protein, omega 3 fatty acids, and other nutritional. The purpose of this study was to determine the potential of fish diversity in the Kedung Ombo reservoir as a provider of sustainable food needs. The research method uses survey and literature review. Based on the results of the literature study, it was found that there were 13 types of fish and came from 7 families. The fish species include parrot fish (Oreochromis niloticus), tilapia fish (Oreochromis mossambicus), Catfish (Pangasius sutchi), tawes fish (Barbodes gonionatus) and betutu fish (Oxyeleotris marmorata). In fish farming activities, one of them must be carried out properly, one of which is by paying attention to the concept of inland public waters in a sustainable manner so that its easy for the community to meet their food needs

ANALISIS REMBESAN TERHADAP KEAMANAN BENDUNGAN KEDUNG OMBO DI GROBOGAN, JAWA TENGAH

A dam, besides having a great benefits to meet human needs, it also can be a big disaster in addition to the dam collapsing. One of the main causes of failure of an embankment dam is the occurrence of excessive seepage which triggers piping events that can disturb the stability and safety of the dam. In general, the body of the Kedung Ombo Dam is in good condition, but there are several problems, such as the drain holes that are overgrown with dense grass which indicates that seepage has occurred. Therefore, it is necessary to evaluate the seepage to determine the safety level of the Kedung Ombo Dam. This study aims to analyze the condition of pore water pressure and seepage that occurs in the body of the Kedung Ombo Dam and to determine the level of safety of the dam body. The analyze was carried out using seepage monitoring instruments installed on the dam, namely the Piezometer and V-Notch at the Kedung Ombo Dam in 2021. Based on the results of the analysis, it was found that the pore water pressure and seepage discharge that occurred in the Kedung Ombo Dam were generally still within the permissible limits. According to the analysis results of the seepage index, the highest QI value is 0.09 at the maximum flood water level of +95 m, where the safety criteria for the seepage index is QI <1. Therefore it indicates that the seepage condition index at the Kedung Ombo Dam are still in a safe condition.Keywords: pore water pressure, seepage, piezometer, V-Notch, seepage index

Interpretasi Instrumentasi Piezometer Dalam Rangka Pemantauan Keamanan Bendungan Kedung Ombo

The embankment dam is the most widely built dam in the world, especially in Indonesia. However, embankment dams are also prone to collapse. Dam failures due to the piping process through the dam body account for 30.5% of the total dam collapses worldwide. Therefore, it is necessary to periodically monitor and evaluate the condition of pore water pressure and seepage in a dam which is usually carried out using installed instrumentation. Very little has been done on instrumentation interpretation of earthfill dams in Indonesia, which is a very worrying condition. It is possible that old or even new dams have shown behavior that leads to a decrease in safety. This condition can be monitored by instrumentation in the dam if interpreted properly. Kedung Ombo Dam as an old embankment dam but has a fairly complete instrumentation can be evaluated for safety related to pore water pressure and phreatic line (seepage line). Pore water pressure evaluation is carried out by collecting piezometer readings and reservoir water level fluctuations over a period of several years. The results of the research on the interpretation of piezometer readings indicate that the overall safety of the Kedung Ombo dam is still good in terms of pore water pressure conditions. However, there are some anomalous conditions that should be investigated further

Typology of Stakeholders in Perspective of Sustainable Tourism Development Use Mactor Method

Tourism represents a complex multi-actor system. The successful sustainable development of tourism areas requires all stakeholders’ support and a map of the strengths, the relations, and the interests of stakeholder actors to determine appropriate institutional policies. This study aims to map stakeholders’ character at the Kedung Ombo tourism area development as a favorite potential destination in Central Java, Indonesia. Data collection used the focused group discussions method. The data analysis used was the Mactor method. This research shows that the Pemalijuana River Flow Management Office, the Indonesian State Forest Company, and the Regional Development Planning Agency were the dominant actors. The Department of Youth, Sports and Tourism, College, village government, the youth organization, and business people are relay actors. College is an autonomous actor; meanwhile, the youth organization, local government, and community are actor-dependent. The Regional Development Planning Agency Department of Youth, Sports and Tourism, college, village government, youth organizations, and business people are convergent actors who can build strong alliances. The support of BBWS Pemali Juana and Perhutani to collaborate is needed to succeed. The research findings are the basis for making a participative institutional design for the Kedung Ombo tourist area’s success and sustainability.

Model hubungan aktor pemangku kepentingan dalam pengembangan potensi pariwisata Kedung Ombo

Keberhasilan pengembangan destinasi wisata membutuhkan analisis tentang karakteristik aktor terkait dengan hubungan antar aktor, sikap aktor terhadap tujuan pengembangan dan kemungkinan aliansi maupun konflik yang muncul. Penelitian ini bertujuan untuk mengidentifikasi tipologi aktor berdasarkan kekuatan dan hubungan antar aktor serta sikap aktor terhadap tujuan pada pengembangan destinasi wisata Kedung Ombo. Penelitian ini menggunakan paradigma penelitian kualitatif-kuantitatif. Metode pengumpulan data menggunakan metode wawancara mendalam, diskusi kelompok fokus dan lokakarya. Analisis data menggunakan metode Mactor (Matrix of Alliances and Conflicts Tactics, Objectives and Recommendations) untuk mengidentifikasi kekuatan, hubungan dan pola aliansi aktor pemangku kepentingan. Hasil penelitian menunjukkan bahwa Balai Besar Wilayah Sungai Pemalijuana, Perum Perhutani dan Badan Perencanaan Pembangunan Daerah, adalah aktor-aktor dominan. Dinas Pemuda, Olahraga dan Pariwisata, Perguruan Tinggi, Pemerintah Desa, Masyarakat, Pelaku Bisnis adalah aktor relay dan Karang Taruna adalah aktor didominasi. Sebagian besar pemangku kepentingan konvergen dalam mendukung tujuan strategis yang yang akan dicapai. Temuan ini menjadi dasar untuk mengembangkan pola kolaborasi antar seluruh pemangku kepentingan yang diperlukan untuk pengembangan potensi pariwisata Kedung Ombo secara berkelanjutan.

RADICALISM THE RESISTANCE OF KEMUSU RESIDENTS TO THE CONSTRUCTION OF KEDUNG OMBO RESERVOIR 1985-2002

Purpose: This research is a study that aims to parse the form of citizens' resistance in Kemusu Sub-district who commit the act of refusal toward government policies that do the construction of Kedung Ombo Reservoir.
 Methodology: Research is done by historical method, namely starting with collecting the data, both written and spoken sources. Utilizing the archives from related institutions, scientific publications, reports and investigations, newspaper clippings, press releases and statements, and the last are observations and interviews. After the data has been obtained, they are analyzed and interpreted by referring to the theory of social movement.
 The main findings: This study reveals the citizens' resistance in Kemusu Sub-district toward the construction of the Kedung Ombo Reservoir as an effort to preserve the habitat of its life. Therefore, the radicalization of the resistance is done in various ways, from the symbolic to the struggle to the realm of the law. Nevertheless, all forms of resistance are done in peaceful and nonviolent ways.
 Application of the study: This research can be a reference for the perpetrator of the social movement to do action without any violence, but put forward substantial matters in the demands. For the government, this paper can provide suggestions and input to do the construction of infrastructure in a humanist way and accommodate the rights of its citizens.
 Originality and Novelty of the study: The new matter in this study is to uncover symbolic actions in the resistance movement of Kemusu citizens that continue straight, even though the construction of the reservoir has been completed. This is what is missed to be recorded in existing research. In addition, most of the research related to citizen refusal toward the construction of the Kedung Ombo Reservoir has always been only seen as a reactive action and missed out in discerning the symbolic and nonviolent matters.

Analisis Tipologi Variabel Strategis pada Pengembangan Kawasan Ekowisata Kedung Ombo

The Kedung Ombo Reservoir area, which is rich in natural resources, has the potential to be developed as an ecotourism area, but institutional issues and policy focus bias have hampered its development. This study aims to identify strategic variables in the region and find a description of the interdependent relationship between these variables, which is useful in determining the right policy. Research data were obtained through focus group discussions and workshops. Data analysis using Micmac method. The results of the study determine 31 (thirty one) strategic variables in the development of the Kedung Ombo ecotourism area which are grouped into typologies as follows: (1) determinant variables, consisting of: special regulations and permits; (2) relay variable, consisting of: community involvement, tourism business potential, infrastructure readiness, tourism awareness, transportation, tourists, tourist attractions, accommodation, tourism promotion, tourism services, private investment, governance, coordination, role of apparatus and information; (3) autonomous variables, consisting of: local entrepreneurial abilities, developer's understanding of local norms, natural beauty, environmental carrying capacity, and accessibility; and (4) dependent variables such as: tax income, retribution income, availability of funds for the community, preservation of local wisdom, expansion of employment opportunities, conservation of reservoir functions, forest preservation, welfare improvement, and poverty reduction. This research also produces a sequence of priority scales of these strategic variables which is very useful for policy makers in directing the focus of policies to ensure the successful development of the Kedung Ombo ecotourism in a sustainable manner.

Analysis of Strategic Variables for Ecotourism Development; an Application of Micmac

This study aims to determine strategic factors and its relationship in developing ecotourism areas. This research uses prospective structural approach. The analytical method uses Micmac to identify the most influential variables and its relation to Kedung Ombo ecotourism development. The results of analysis which realize the typology of strategic variables based on the strength of influence found 6 classifications of variable, namely: 1. The dominant variable consists of: regulation, and governance; 2. Key variable (Relay variable) consists of: institutional coordination, apparatus role, tourism marketing and tourism promotions. 3. Autonomous variable consists of: natural beauty, accessibility, potential of market tourism, local awareness of tourism. 4. The output variable consists of: funds for community, preservation of local wisdom, preservation of forest sustainability, conservation of reservoir function. 5. Regulators variable consists of: special permit policy for investment, retribution policy, tax policy, allowance policy, tourist attractions. 6. Secondary variable consists of: availability of tourism infrastructure, tourist interest of ecotourism, involvement of local community. The results of this study show a variety of information sources for policy makers in Kedung Ombo ecotourism development in a sustainable manner.

Plant diversity based on pollen and spores morphology from sediment lake of Kedung Ombo Purwodadi

Kedung Ombo Lake was an artificial lake that has formed since 26 years ago. Environmental has changed from the terrestrial environment into the aquatic environment, because of that the diversity of flora around the Lake Kedung Ombo was changed. The diversity of flora can be learned through the morphology of pollen and spores. Aimed of this study was to determine the diversity of plants based on the morphology pollen and spores that found in the Lake Kedung Ombo sediment. Sampling took by coring clay soil sediment in depth of 1 m, located near the outlet of Lake Kedung Ombo. Data were analyzed by making the morphology of pollen and spores description. The result showed that morphology of pollen and spores are found in the Lake Kedung Ombo sediment has a variety of shapes and sizes. The plant's diversity obtained are 25 taxa plants that were categorized into 3 taxa of arboreal pollen (AP), 9 taxa of non-arboreal pollen (NAP) and 13 taxa of spores. The dominance of taxa NAP is Celtis sp. (45,12%), this suggested that shrubs or not plant trees were more developed in Lake Kedung Ombo environment. The study concluded that the value of diversity index categorized as low and the value of similarity index categorized as high, it means that plant diversity was quite similar and there is no significant changes of diversity with their presence were quite stable.

AGROWISATA SEBAGAI PENGEMBANGAN WISATA KAWASAN WADUK KEDUNG OMBO DENGAN PENDEKATAN ARSITEKTUR EKOLOGIS

<p><em>The d</em><em>esign</em><em> of </em><em>Agro</em><em>tourism in</em><em> Kedung Ombo Region motivated by the development of tourism potential Kedung Ombo Grobogan, development</em><em> of</em><em> Grobogan agricultural potential, as well as the phenomenon</em><em> of</em><em> Grobogan farmers who sell agricultural products </em><em>that</em><em> still in the form of raw materials.</em><em> </em><em>Objectives to be achieved is to design an agro as the development of tourism potential of being owned</em><em> by</em><em> Grobogan on Kedung Ombo with objects in agriculture, fisheries, livestock, and industrial fields. Design issue is how to design agrotourism as a tourist development area Kedung Ombo with Ecological Architecture approach. The approach used in determining the design is to use the concept of Ecological Architecture applied in structuring the mass of the building in the site, determining the direction of view and orientation of the building that adapts to the movement of the sun, structuring monetary affairs which can save energy, the selection of environmentally friendly materials, the use of sunlight as a source of energy, the use of water in the form of an element and an artificial river as a natural cooling and water treatment plants, the use of several types </em><em>of</em><em> </em><em>vegetation as a natural shade on the site.</em></p><p align="left"><em> <br /> <strong>Keywords:</strong> Architecture, Agro</em><em>tourism, </em><em>Ecological Architecture</em><em>, </em><em>Kedung Omb</em><em>o.</em></p>