Judul: Evaluation of Ecological Functions and Amenities in Puring Park and Tabebuya Park, South Jakarta
Abstrak: Fungsi ekologis dari suatu taman merupakan salah satu aspek yang perlu dikaji untuk memberikan fungsi yang optimal ke sekitarnya. Penelitian ini bertujuan mengetahui karakteristik vegetasi, menganalisis kemampuan vegetasi dalam menyerap karbon, menghasilkan, dan mengurangi polutan, menganalisis tingkat kenyamanan, serta mengetahui persepsi dan preferensi pengguna terhadap Taman Puring dan Taman Tabebuya. Pengolahan dan analisis data pada penelitian ini menggunakan I-Tree Tools dan Temperature Humidity Index. Berdasarkan hasil penelitian ini, kedua taman mampu menyerap 8,58 ton karbon per tahun dan menyimpan 97,9 ton karbon. Selain itu, kedua taman ini mampu menghasilkan 22,88 ton oksigen per tahun dan juga mereduksi polutan sebanyak 149.920,1g/m!/th. Taman Puring memiliki nilai THI 28,66 dan Taman Tabebuya memiliki nilai 29,83. Oleh karena itu, ada beberapa rekomendasi yang dapat diberikan untuk meningkatkan fungsi ekologis dari kedua taman agar lebih optimal, seperti penambahan pohon berbatang dengan diameter besar, umur panjang, berdaun lebar, bertajuk rimbun, dan pemeliharaaan yang terjadwal dan sesuai. Hasil dari penelitian ini dapat menjadi rekomendasi dan masukan untuk pemerintah dalam meningkatkan kualitas taman., The ecological function of a park is one of the aspects that need to be studied to provide optimal functions to its surroundings. This research aims to understand the characteristics of vegetation, analyze the ability of vegetation to absorb carbon, produce and reduce pollutants, analyze comfort levels, and understand user perceptions and preferences towards Taman Puring and Taman Tabebuya. Data processing and analysis in this study use I-Tree Tools and the Temperature Humidity Index. Based on the results of this study, both parks are able to absorb 8.58 tons of carbon per year and store 97.9 tons of carbon. Additionally, these parks are able to produce 22.88 tons of oxygen per year and also reduce pollutants by 149,920.1 g/m!/th. Taman Puring has a THI value of 28.66 and Taman Tabebuya has a value of 29.83. Therefore, several recommendations can be given to enhance the ecological function of both parks to be more optimal, such as adding trees with large diameters, long lifespans, broad leaves, dense canopies, and scheduled and appropriate maintenance. The results of this study can serve as recommendations and input for the government to improve the quality of parks.
Keyword: fungsi ekologis, ruang terbuka hijau, vegetasi, i-tree

Judul: Landscape Services Management of Biodiversity and Carbon Stock City Park in Jakarta
Abstrak: Perkembangan wilayah perkotaan, terutama di DKI Jakarta, memberikan dampak positif dan negatif pada kualitas lanskap. Peningkatan polusi udara merupakan salah satu bentuk dampak negatif pada kualitas lanskap. Perkotaan seringkali menjadi sumber polusi udara tinggi, terutama dari pusat industri. Oleh karena itu, penting untuk memahami peran Ruang Terbuka Hijau (RTH), khususnya taman kota, dalam memperbaiki kualitas lanskap. RTH memiliki fungsi ekologi untuk mereduksi polusi udara, memberikan kontribusi pada keberlanjutan kota. Penelitian ini bertujuan untuk menganalisis jasa lanskap berupa biodiversitas dan karbon tersimpan menggunakan i-Tree Eco dan menyusun rekomendasi pengelolaan berdasarkan analisis SWOT. Analisis jasa lanskap biodiversitas diklasifikan dengan indeks Shannon-Wiener, sementara analisis cadangan karbon juga diklasifikasikan berdasarkan kriteria jumlah karbon tersimpan. Berdasarkan analisis Indeks Shannon-Wiener, Indeks keanekaragaman pada Taman Suropati dengan nilai 1,30 termasuk kategori keberagaman sedang, Taman Menteng dengan nilai 3,21 termasuk kategori keberagaman tinggi dan Taman Puring dengan nilai 1,34 termasuk kategori keberagaman sedang. Berdasarkan hasil analisis i-Tree Eco karbon tersimpan pada Taman Suropati sebesar 114,11 (ton/ha) termasuk kategori karbon tersimpan tinggi, pada Taman Menteng sebesar 41,7 (ton/ha) termasuk kategori karbon tersimpan rendah dan untuk karbon tersimpan pada Taman Suropati sebesar 56,4 (ton/ha) termasuk kategori karbon tersimpan sedang. Pada hasil analisis SWOT menunjukan bahwa skor IFE dan EFE berada pada posisi kuadran I (Grow and build strategy) strategi ini berfokus pada pengelolaan dan pengembangan lanskap. Berdasarkan hal tersebut, diperoleh strategi-strategi pengelolaan yang dapat diterapkan pada Taman Suropati, Taman Menteng dan Taman Puring diantaranya, meningkatkan biodiversitas dan karbon tersimpan dengan penanaman dan penyulaman, memberikan edukasi kepada masyarakat terkait kesadaran akan pentingnya menjaga kebersihan taman kota dan melakukan pengawasan terhadap pemeliharan rutin fasilitas dan vegetasi yang ada di Taman Kota., The development of urban areas, especially in DKI Jakarta, has both positive and negative impacts on landscape quality. One of the negative impacts is the increase in air pollution. Urban areas often become sources of high air pollution, particularly from industrial centers. Therefore, it is important to understand the role of Green Open Spaces, especially city parks, in improving landscape quality. Green Open Spaces has an ecological function to reduce air pollution and contributes to urban sustainability. This study aims to analyze landscape services in terms of biodiversity and stock carbon using i-Tree Eco and to develop management recommendations based on SWOT analysis. The analysis of biodiversity landscape services is classified using the Shannon-Wiener index, while the analysis of carbon stock is classified based on the amount of stocked carbon. According to the Shannon-Wiener Index analysis, the biodiversity index in Suropati Park with a value of 1,30 is categorized as medium diversity, Menteng Park with a value of 3,21 is categorized as high diversity, and Puring Park with a value of 1,34 is categorized as medium diversity. Based on the I-Tree Eco analysis, the carbon stock in Suropati Park is 114,11 (tons/ha), categorized as high stock carbon, in Menteng Park it is 41,7 (tons/ha), categorized as low stock carbon, and in Puring Park it is 56,4 (tons/ha), categorized as medium stock carbon. The SWOT analysis results show that the IFE and EFE scores are in quadrant I (Grow and build strategy), focusing on
Keyword: I-Tree Eco, jasa lanskap, manajemen lanskap, ruang terbuka hijau, taman kota

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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