Judul: The Suitability of Green Open Space in the Regional Spatial Plan Using SPOT-7 Imagery in Bojonggede, Cibinong, Citeureup, Kabupaten Bogor Regency
Abstrak: Pemerintah Kabupaten Bogor telah menetapkan kawasan Ruang Terbuka Hijau dengan luas minimal 30 % dari luas wilayah perkotaan. Hal ini telah ditetapkan pada dokumen Rencana Tata Ruang Wilayah (RTRW) Kabupaten Bogor yang berlaku pada tahun 2016 hingga tahun 2036. Tujuan penelitian ini yaitu menganalisis perubahan tutupan lahan yang terjadi di Kecamatan Bojonggede, Cibinong, dan Citeureup dan hasil klasifikasi RTH disesuaikan dengan RTRW yang terjadi pada tahun 2015 dan 2020. Analisis dilakukan menggunakan citra SPOT-7 tahun 2015 dan 2020 dengan metode klasifikasi secara visual. Hasil menunjukkan bahwa terjadi peningkatan luasan permukiman di setiap wilayah yang diakibatkan oleh pertambahan penduduk. Penurunan RTH terjadi di Kecamatan Bojonggede sebesar 3,85 %. Kecamatan Citeureup mengalami penurunan RTH pada permukiman perkotaan kepadatan tinggi, sedang, dan rendah masing-masing sebesar 1,13 %, 8,2 %, dan 1,58 %. Kecamatan Cibinong mengalami penurunan sebesar 1,84 %. Penurunan luasan RTH ini masih dalam batasan aman karena luasannya masih memenuhi persyaratan yang ditetapkan pemerintah minimal 30%., The government of Bogor Regency has established a Green Open Space (RTH) with anarea at least 30 % of the urban land. Bogor Regency’s Spatial Planning (RTRW) was determined in a document which is valid from 2016 to 2036. The purpose of this study is to analyze land cover changes that occur in Bojonggede, Cibinong, and Citeureup Subdistricts and to adjust the results of the Green Open Space classification with the Spatial Planning that occurred in 2015 and 2020. The analysis was carried out using SPOT-7 in 2015 and 2020 images with a visual classification method.The results showdecreasesettlements in each subdistrict caused by population growth. The decrease of Green Open Space that occurred in Bojonggede Subdistrict was 3.85 %. Citeureup Subdistrict experienced a decrease in Green Open Space on urban settlements with high, medium, and low density by 1,13 %, 8,2 %, and 1,58 %. Cibinong Subdistrict’s Green Open Space has decreased by 1.84 %. The decreased Green Open Space is in safe range because the area still meets the requirement made by the government, by 30% minimum.
Keyword: Change, Green Open Space, Land Cover, Regional Spatial Planning, SPOT-7 Imagery

Judul: Suitability of Green Open Spaces on Spatial Patterns Using SPOT-7 Imagery in Sukaraja and Babakan Madang Districts Bogor Regency
Abstrak: Perkembangan daerah urban yang cukup tinggi berpengaruh pada percepatan pembangunan daerah, dan mengakibatkan perubahan tutupan lahan. Perubahan tutupan lahan terkendali dengan adanya rencana tata ruang wilayah (RTRW). Penelitian ini bertujuan menganalisis perubahan tutupan lahan di Kecamatan Sukaraja dan Babakan Madang, serta analisis kesesuaian tutupan ruang terbuka hijau (RTH) dengan pola ruang RTRW Kabupaten Bogor. Analisis perubahan tutupan lahan dilakukan dengan mengklasifikasi secara visual menggunakan citra SPOT-7 tahun 2016 dan 2021. Hasil klasifikasi tutupan lahan memiliki nilai indeks kappa sebesar 0,91. Perubahan luas tutupan lahan menjadi lahan terbangun terus bertambah, sedangkan luas RTH menurun. Luas RTH mengalami penurunan sebesar 5,41% di Kecamatan Sukaraja dan 2,79% di Kecamatan Babakan Madang. Kesesuaian luas RTH dengan pola ruang RTRW di Kecamatan Sukaraja sebesar 93,71% pada tahun 2016 dan mengalami penurunan pada tahun 2021 menjadi 91,83%, sedangkan di Kecamatan Babakan Madang sebesar 97,87% pada tahun 2016 dan mengalami penurunan menjadi 97,14% pada tahun 2021. Luas RTH di Kecamatan Sukaraja dan Babakan Madang masih memenuhi aturan yang ditetapkan pemerintah yaitu minimal 30% dari luas wilayah perkotaan., The relatively high development of urban area has an effect on acceerating regional development, resulting in changes in land cover. Changes of land cover are controlled by having a regional spatial planning (RTRW). This study aims to analyze the suitability of green open space (RTH) cover with the spatial patterns of the Bogor Regency spatial plan. Analyze of land cover change was carried out by visual classification method using SPOT-7 imagery for 2016 and 2021. The results of land cover classification have a kappa index value of 0,91. Changes in land cover to built-up land have continued to increase, while the area of green open space decreased. The area of green open space decreased by 5,41% in Sukaraja District and 2,79% in Babakan Madang District. The suitability of the area green open space with spatial patterns in Sukaraja District was 93,71% in 2016 and decreased in 2021 to 91,83%, while in Babakan Madang District it was 97,87% in 2016 an decreased to 97,14% in 2021. The area of green open space in Sukaraja an Babakan Madang sub-district still meets the goverment’s regulations, namely a minimum of 30% of the urban area.
Keyword: green open space, index kappa, land cover change, regional spatial plan, SPOT-7 imagery

Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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