Judul: Analisis Cadangan Karbon Sebagai Jasa Lanskap Padang Golf di JABOPUNJUR
Abstrak: Golf courses as man-made landscapes have an important contribution to ecosystem dynamics. Up to now there is still few information of potential carbon stock from golf course vegetation. The presence of vegetations in golf course that able to sequestrate the carbon dioxide were needed for climate change mitigation in order to creating low Carbon as one of the environmental services. This research was conducted at three study sites of golf courses in Jakarta, Bogor, Puncak, and Cianjur (JABOPUNJUR), i.e Cibodas Golf Park, Bogor Golf Club, and the Golf Pantai Indah Kapuk. Those study sites were selected due to the different elevation, Cibodas Golf Park 1330 m above sea level (m asl), Bogor Golf Club 230 m asl, the Golf Pantai Indah Kapuk 3 m asl, respectively. The objectives of this research were: 1) to analyse potential carbon stock in turfgrass, 2) to analyse potential carbon stock of trees and 3) to analyse the structure composition and type of vegetation. There were 42 sampling plot scattered and observed at Cibodas Golf Park, Bogor Golf Club, and the Golf Pantai Indah Kapuk. Carbon stock estimation was calculated by non-destructive sampling method using existing allometric equation. Based on the results turfgrass contributes smaller carbon stock than tree stands on game area, only less than 25 % of the total value from carbon stock in all golf courses. Turfgrass carbon stock increased following by decreasing elevation 7530.26, 9531.36, and 10828.34 kg/ha in Cibodas Golf Park, Bogor Golf Club, and the Golf Pantai Indah Kapuk respectively. On the other side, the highest trees carbon stock was found in Bogor Golf Club 35931.42 kg/ha, following by the Golf Pantai Indah Kapuk 23496.40 kg/ha, and Cibodas Golf Park 10332.97 kg/ha. According to vegetation analysis the level of species diversity was medium at Cibodas Golf Park (H’ = 2.73) and high at Bogor Golf Club (H’ = 4.19), and the Golf Pantai Indah Kapuk (H’ = 3). The difference of carbon stock in turfgrass and trees were strongly influenced by the elevation, age and structure of the trees, as well as basal area of vegetation stands.
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Judul: Studi Laju Infiltrasi pada tanah bervegetasi pepohonan dan rumput di Bogor Golf Club dan Cibodas Golf Park
Abstrak: Di negara asalnya (Skotlandia) padang golf biasanya dibangun di atas lahan yang tidak produktif dengan desain yang sederhana. Dalam perjalanan selanjutnya timbul kecenderungan untuk membangun padang golf dengan desain yang lebih artistik. Sehingga padang golf yang mulanya murni dipakai sebagai sarana olah raga, berkembang menjadi sebuah industri yang menguntungkan. R Kecenderungan inilah yang melanda negara-negara di kawasan Asia Pasifik termasuk Indonesia. Menurut data yang terkumpul, di Bogor saja terdapat 15 padang golf (Majalah Progolf, 1995). Akibat perkembangan pembangunan padang golf ini, Bogor sering dijadikan sebagai penyebab, bila terjadi banjir di daerah Jakarta. Tujuan penelitian ini untuk mengetahui tingkat kemampuan lahan bervegetasi rumput dan pepohonan dalam peresapan air ke dalam tanah (infiltrasi) di lapangan golf yang sudah lama dan lapangan golf yang masih baru. Penelitian ini dilakukan di lapangan Bogor Golf Club dan Cibodas Golf Club selama satu bulan (awal Mei Juni 1997). Pengukuran laju infiltrasi dilakukan dengan alat single ring infiltrometer. Laju infiltrasi ini diukur pada tanah yang berpenutupan rumput (fair-way) dan pepohonan sebanyak delapan ulangan dengan lokasi pengukuran ditentukan secara acak....
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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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