Judul: Economic Valuation of Non-Use Value and The Management Strategy of Tebet Eco Park, South Jakarta
Abstrak: Keberadaan ruang terbuka hijau di Daerah Khusus Ibukota Jakarta sangat penting karena memiliki berbagai macam fungsi, terutama di wilayah dengan aktivitas masyarakat yang banyak polusi. Besarnya potensi yang dimiliki RTH Tebet Eco Park menjadikan keberadaannya sangat dibutuhkan ditengah permasalahan wilayah perkotaan, oleh karena itu penelitian ini dilakukan dengan tujuan (1) menganalisis persepsi masyarakat terhadap pengelolaan Tebet Eco Park, (2) mengestimasi besaran nilai ekonomi keberadaan dan nilai ekonomi warisan Tebet Eco Park, (3) menganalisis strategi pengelolaan Tebet Eco Park. Metode yang digunakan dalam penelitian ini adalah skala likert, Contingent Valuation Method (CVM), dan PROMETHEE. Hasil penelitian ini menunjukkan bahwa pengunjung memiliki penilaian sangat baik terhadap Tebet Eco Park. Nilai ekonomi non-guna Tebet Eco Park adalah sebesar Rp6.584.116.974 per tahun dengan rincian untuk nilai ekonomi keberadaan sebesar Rp1.182.210.355 per tahun dan untuk nilai ekonomi warisan sebesar Rp5.401.906.619 per tahun. Alternatif kebijakan yang dapat dijadikan prioritas dalam membuat strategi pengelolaan Tebet Eco Park adalah revitalisasi sungai kemudian peningkatan pemeliharaan vegetasi yang ada di Tebet Eco Park., The existence of green open space in DKI Jakarta is very important because it has various functions, especially in areas with high pollution level. The large potential of the Tebet Eco Park makes its existence very much needed to overcome theproblems in urban areas. These research aims are to(1) Analyze public perceptions of Tebet Eco Park management, (2) Estimate the economic value of existence and the economic value of inheritance of Tebet Eco Park, (3) Analyze the management strategy of Tebet Eco Park. The methods used in this study are the Likert scale, Contingent Valuation Method (CVM), and PROMETHEE. The results of this study indicate that visitors have a very good assessment of Tebet Eco Park. The non-use economic value of Tebet Eco Park is IDR 6.584.116.974 per year, with details of the existence economic value of IDR 1.182.210.355 per year and the bequest economic value of IDR 5.401.906.619 per year. Alternative policy that can be prioritized in Tebet Eco Park are river revitalization and then increasing the maintenance of existing vegetation in Tebet Eco Park.
Keyword: CVM, PROMETHEE, persepsi pengunjung, ruang terbuka hijau, willingness to pay

Judul: The Value of Green Open Space in the Forest Park of Penjaringan, North Jakarta
Abstrak: Kepadatan penduduk dan aktivitas ekonomi yang terus meningkat dapat menyebabkan perubahan penggunaan lahan yang dapat menurunkan kualitas lingkungan terutama di wilayah perkotaan. DKI Jakarta termasuk kota yang merasakan dampak dari penurunan kualitas lingkungan. Keberadaan Ruang Terbuka Hijau merupakan salah satu upaya untuk menyeimbangkan dan memperbaiki kualitas lingkungan. Pada saat ini RTH di DKI Jakarta baru berjumlah 9,8% dari 30% target minimal yang ditetapkan berdasarkan Undang-undang Nomor 26 Tahun 2007. Taman Hutan Kota Penjaringan (THKP) merupakan bentuk dari RTH yang berada di DKI Jakarta. Keberadaan THKP mempunyai fungsi ekologis seperti daerah resapan air, penyerap karbon,dan kesejukan. Penelitian ini bertujuan untuk (1) Menganalisis persepsi pengunjung terhadap keberadaan Taman Hutan Kota Penjaringan, (2) Mengestimasi nilai WTP pengunjung terhadap keberadaaan Taman Hutan Kota Penjaringan, (3) Mengestimasi nilai ekonomi guna tidak langsung Taman Hutan Kota Penjaringan.Metode yang digunakan dalam penelitian ini adalah skala likert, Contingent Valuation Method (CVM), Pendekatan harga pasar, benefit transfer dan replacement cost. Hasil pada penelitian ini menunjukkan bahwa persepsi pengunjung terhadap keberadaan Taman Hutan Kota Penjaringan adalah sangat baik. Estimasi nilai total WTP pengunjung sebesar Rp 28, Population density and economic activity that continues to increase can lead to changes in land use that can reduce environmental quality, especially in urban areas. DKI Jakarta is one of the cities that feel the impact of the decline in environmental quality. The existence of Green Open Space is one of the efforts to balance and improve the quality of the environment.. Currently, green open space in DKI Jakarta is only 9.8% of the 30% minimum target set based on Law No. 26 of 2007. Penjaringan City Forest Park (THKP) is a form of green open space located in DKI Jakarta. The existence of THKP has ecological functions such as water catchment areas, carbon sinks, and coolness. This study aims to (1) analyze visitors' perceptions of the existence of the Penjaringan City Forest Park, (2) estimate the WTP value of visitors to the existence of the Penjaringan City Forest Park, (3) estimate the economic value for the indirect use of the Penjaringan City Forest Park. The method used in this study These are Likert scale, Contingent Valuation Method (CVM), market price approach, benefit transfer and replacement cost. The results of this study indicate that the visitor's perception of the existence of the Penjaringan City Forest Park is very good. The estimated total WTP value for visitors is IDR 8,615,503,707 / year. The total economic value for indirect use is IDR 224.563.442,30/year.
Keyword: Contingent Valuation Method, Hutan Kota, Nilai guna tidak langsung, Valuasi ekonomi, Willingness to pay, Economic Value, Indirect use value

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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