Application of TRMM in the Hydrological Analysis of Upper Bengawan Solo River Basin

Abstract

Rainfall is a major water resource with a significant role in terms of growth, environment concerns, and sustainability. Several human activities demand adequate water supply for drinking, agriculture, domestic, and commercial consumption. The accuracy of any hydrologic study depends heavily on the availability of good-quality precipitation estimates. Most countries are unable to provide sufficient climatic data, including rainfall and observed discharge statistics. This scarcity is a huge obstacle in conducting thorough hydrologic studies over a certain period. For instance, Indonesia, as an archipelagic country, has long been faced with data availability problems. For this reason, Tropical Rainfall Measuring Mission (TRMM), which was developed by NASA, became an alternative solution to rainfall data limitations. However, to be applied in hydrologic investigations, TRMM data require proper estimation and adjustment. The aim of this study was to evaluate the quality of TRMM rainfall data and its application in determining design flood and water availability. Dividing the data into several groups based on its magnitude and multiplying each unit with a correction coefficient are parts of the modification process. Subsequently, objective functions, including false alarm ratio (FAR), probability of detection (POD), and root mean square error (RMSE) were also applied. Rainfall-runoff modeling and design storm analysis at Delingan dam were used to study the TRMM correction performance. Based on the analysis, corrected TRMM showed considerable findings compared to ground station data. Model calibration and verification using corrected TRMM data provide satisfactory model parameters compared to ground station derivatives. The results also disclosed a closer fit of the corrected TRMM to catchment response translated from derived rainfall-runoff model parameters to ground station compared to control. Furthermore, design storm calculated from corrected TRMM reflects an improvement compared to uncorrected TRMM data.

The Use of Tropical Rainfall Measuring Mission Rainfall Data as Input Data for Water Availability Analysis With Rainfall-Runoff Models in the Melawi Sub-Basin

“…Stage 1: Spatially plotting all TRMM grids and observation stations to be used in the study area (ii). Stage 2, selecting TRMM grids based on the correlation and RMSE analysis of TRMM grids to observation stations, with the criteria that the selected TRMM grid for validation must correlate (r) to the observation station ≥ 0.6 (Senjaya, 2020) and RMSE ≤ 130 mm (Soeryamassoeka, 2020). (iii).…”

Comparison of flood hydrograph prediction between synthetic unit hydrograph methods and rain-on-grid model for Katulampa watershed, Indonesia

“…Nevertheless, such satellite-derived data require proper corrections before using them for computations because they are affected by a lot of uncertainty, such as sun radiation, temperature, cloud cover, etc. (Senjaya et al, 2020). In our study, the regional rainfall values for the Katulampa watershed were computed using the Thiessen polygon method, as seen in Figure 3.…”

Evaluasi Kinerja Model Hujan Aliran Lumped Dalam Penentuan Aliran Dasar Di Daerah Aliran Sungai Citarum

“…Model HBV-96 membagi lapisan tanah menjadi tiga dan satu channel routing berdasarkan respon tanah terhadap hujan. Empat lapisan tersebut diantaranya yaitu: X1 (Soil Moisture Storage), X2 (Upper Storage), X3 (Lower Storage/Ground Water) dan X4 (aliran air sungai) (Senjaya et al, 2020). Pada Model HBV96, parameter model yang mempengaruhi aliran dasar adalah kecepatan air mengalir ke bawah karena proses perkolasi alami, koefisien daya untuk recharge dan perkolasi, tinggi kelembaban tanah aktual, koefisien untuk aliran air tanah, dan kapasitas penyimpanan kelembaban tanah maksimum.…”