Evaluasi Kesesuaian Data Tropical Rainfall Measuring Mission (TRMM) dengan Data Pos Hujan Pada Das Temef di Kabupaten Timor Tengah Selatan

Abstract

<jats:p>The construction of the Temef Dam in Oenino Village, Oenino District, and Konbaki Village, Polen District, South Central Timor Regency requires long and reliable rainfall data. To overcome the minimum data or the unavailability of automatic rainfall (ARR) and discharge data in the past decades, the use of Tropical Rainfall Measuring Mission (TRMM) satellite data is foreseen. The accuracy of TRMM data is obtained when the parameters of suitability and compatibility of TRMM are in a good agreement with the ARR. For the Temef watershed, there are six rainfall stations that were reviewed, namely Fatumnasi, Oeoh, Noelnoni, Polen, Nifukani, and Batinifukoko rainfall stations. Direct comparisons of rainfall data were conducted for 20 years (1998-2018) with temporal resolution on a monthly and daily basis. The results of the study show that the rainfall patterns in the TRMM data product (version 3B42V7) tend to be consistent with 3 rainfall stations in the Temef watershed namely Noelnoni, Fatumnasi, and Batinifukoko. A correlation coefficient of 0.505 – 0.813 was obtained from TRMM data calibration at monthly basis while a correction factor level of 0.0056 - 0.0129 was obtained for daily. The calibration on the annual maximum daily rainfall data resulted in a correction factor of 0.0298 - 0.2516. Monthly and daily TRMM data fit well with the data of 3 rainfall stations. However, the Noelnoni rainfall station showed poor results on the annual maximum daily rainfall.Keywords: TRMM data, ARR data, correction factor, correlation coefficient</jats:p>

Curve Number Estimation for Ungauged Watershed in Semi-Arid Region

“…Therefore, in the application of mean CN (65.32) for design floods estimation is not allowed. The trend line obtained on the Benanain watershed is similar to previous researchers [21,26], but the area study (watershed area) is smaller than this case. Hawkins (1993) suggests that the asymptotic line is a common and standard hydrological response to watershed behavior [29].…”

“…The maximum daily rainfall has varied between 16-68 mm in the eastern region, while 120-255 mm in most of the northern. The average annual rainfall has estimated at 1,500 mm/year [26]. This research used ten rainfall stations for ten years (1996-2008) and spread across four districts that crossed by the Benanain watershed.…”

Evaluasi Kesesuaian Data Satelit sebagai Alternatif Ketersediaan Data Evaporasi di Waduk Wonorejo

“…Konsistensi pola lengkung atau kecenderungan naik turun dua data yang dibandingkan tersebut dapat menjadi satu identifikasi dalam menyimpulkan kualitas data (Krisnayanti, Denik Sri, 2019). Bentuk persamaan regresi terpilih ditentukan dari nilai koefisien determinasi (R 2 ) tertinggi yang dihasilkan pada masing-masing persamaan (Harisuseno, D. & Cahya, E.N., 2020).…”

Analysis of Available Discharge in the Temef Watershed Using the NRECA, F. J. Mock and Tangki Method

“…Pembangunan bendungan terdiri atas beberapa tahapan, salah satunya yaitu tahap pengisian awal yang dilakukan setelah pelaksanaan konstruksi bendungan selesai dan merupakan saat kritis yang dilalui pada saat pembangunan bendungan. Pada tahap pengisian awal ini jumlah debit inflow yang masuk ke genangan akan sangat berpengaruh, karena jika inflow yang masuk sedikit maka waktu pengisian awal akan lama dan dapat mengakibatkan keringan di daerah hilir bendungan (Krisnayanti et al, 2020). Dalam analisis pengisian awal waduk terdapat beberapa metode untuk menghitung besarnya debit seperti Metode NRECA, Metode F.J. Mock, dan Metode Tangki.…”

“…Debit andalan (dependable discharge) didefinisikan sebagai debit yang tersedia sepanjang tahun dengan resiko kegagalan tertentu (Limantara, 2018). Beberapa penelitian perhitungan debit andalan yang telah dilakukan baik dengan salah satu metode yaitu Metode Tangki (Setiawan, et al, 2003;Amaral, 2018;Krisnayanti, et al, 2020), perbandingan antara dua metode yaitu Metode NRECA dan Metode F.J. Mock (Indra, et al,2012) maupun dengan perbandingan debit andalan ketiga metode, yaitu Metode NRECA, F.J. Mock dan Tangki (Setyono, 2011). Perhitungan debit Metode NRECA dan F.J. Mock merupakan dua metode yang dianjurkan menurut KP-01 tahun 2013.…”