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Denik Sri Krisnayanti
Civil Engineering Study Program, Nusa Cendana University
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Environmental Science Health Professions Materials Science & Nanotechnology Social Sciences Transportation

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Journal : Civil Engineering Journal

 1 
Curve Number Estimation for Ungauged Watershed in Semi-Arid Region Krisnayanti, Denik Sri; Bunganaen, Wilhelmus; Frans, John H.; Seran, Yustinus A.; Legono, Djoko
Civil Engineering Journal Vol 7, No 6 (2021): June
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/cej-2021-03091711

Abstract

The Benanain Watershed is located in East Nusa Tenggara with an area of 3,181 km2 and is divided into 29 sub-watersheds. The East Nusa Tenggara itself is an eastern region of Indonesia with a unique climate condition called semi-arid. The high rainfall intensity occurring in short duration results in large surface runoff and erosion. Floods and erosion in semi-arid areas due to sensitive soils to drought and heavy rainfall extremely. This paper presents the application of the Soil Conservation Services-Curve Number (SCS-CN) real-flood flows through a digital map of soil type, land use, topography, and the heterogeneity of physical condition, especially for ungauged watersheds. The method used is an approach empirical to estimate runoff from the relationship between rainfall, land use, and soil hydrology groups. This watershed has a large area that must analyze every sub-watershed. The land-use of the Benanain watershed is secondary dryland forest by 44.26% and the hydrological soil group on the B group classification with medium to high absorption potential by 46.502% from the total area. The curve number value of the Benanain Watershed ranges from 56.54 to 73.90, where the mean CN value of 65.32. The rainfall (mm) for the 29 sub-watersheds in the Benanain Watershed has decreased by about 74.65% when being surface runoff or only 25.35% of water becomes surface runoff. The relationship between rainfall depth and CN is classified as standard response and trend line (flat slope) equilibrium occurs when rainfall depth value of 56.71 mm and CN is close to 66.30. The high variability of intense rainfall between the rainy season and the dry season had a significant influence on the curve number value in a large watershed area. Further analysis will be more accurate if it is supported by long rainfall data and observation runoff data as a control. Doi: 10.28991/cej-2021-03091711 Full Text: PDF
Analysis of Flood Discharge due to Impact of Tropical Cyclone Denik Sri Krisnayanti; Philipi de Rozari; Vilkanova C. Garu; Alvine C. Damayanti; Djoko Legono; Hamdan Nurdin
Civil Engineering Journal Vol 8, No 9 (2022): September
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2022-08-09-01

Abstract

Tropical Cyclone Seroja, which occurred between April 2 to 6, 2021, is one of the strongest storms ever in East Nusa Tenggara. The track results of the cyclone showed that Seroja, formed at coordinates 10.5° S and 123° E, moved towards west longitude to Sumba Island and continued towards Australia. Moreover, the Global Precipitation Measurement (GPM) output was used to analyze the rainfall conditions at the center of the Seroja cyclone through the Kambaniru watershed in East Sumba, and the results showed that the precipitation continued to increase during Seroja's development to reach 225 mm. Therefore, this study aimed to analyze the effect of the rainfall during the storm on the maximum runoff experienced in the Kambaniru watershed through the application of quantitative analysis on the rainfall data from GPM data. The process involved analyzing the flood discharge using the HSS-SCS Curve Number method and GPM data, which were initially used to evaluate the rainfall during the TC Seroja due to limited field data. The results showed that the CN value in the Kambaniru watershed was in the AMC III condition with a curve number of 88.90 and the maximum flood during the Seroja storm was recorded to be 2,987 m3/s which is higher than the flood discharge for the 500 year return period. It was also discovered that the narrowing of the river channel on the Kambaniru Bridge section contributed to the collapse of the bridge. Doi: 10.28991/CEJ-2022-08-09-01 Full Text: PDF
Evaluation of GPM IMERG Product Against Ground Station Rainfall Data in Semi-Arid Region Krisnayanti, Denik Sri; Pah, Jusuf J. S.; Klau, Ralno R.; Decaprio, Alex; Syamsumarlin, .
Civil Engineering Journal Vol 10, No 12 (2024): December
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2024-010-12-09

Abstract

Benanain River is the longest and largest river on Timor Island, with a length of 132 km and an area of 6,460.12 km². In this region, a significant factor affecting the presence of surface water sources is rainfall. To compensate for the lack or unavailability of automatic Rainfall Data (RD) in the Benanain River Basin (BRB), Global Rainfall Measurement (GPM) data from 1998 to 2018 (20 years) were used. The accuracy of GPM rainfall analysis was obtained when parameter conformity and compatibility with data recorded at Rainfall Station (RS) were maintained. The difficulty of predicting rainfall values, spatially and temporally, in the field led to data gaps and unreliable data for analysis needs. Additionally, RD obtained from observation stations contributed to measuring rainfall because there was insufficient RD for analysis in a few regions. The challenge of accurately predicting rainfall values in the field led to differences in data, rendering it unreliable for analysis. To address this issue, satellite data was required as an alternative method to estimate rainfall. Among a total of 7 RS, only 2 passed rainfall characteristic tests. Following this discussion, Lahurus station showed a correlation coefficient of 0.7046, an RMSE of 25.89, and an NSE of 0.476. In addition, the rainfall characteristic test result for Haliwen Station was 1.66 (R100/R2). The second station that passed was Kaubele Station, signifying a correlation coefficient of 0.7907, RMSE of 25.28, and NSE of 0.604. Additionally, the rainfall characteristic test result for Haliwen Station was 3.04 (R100/R2) and the daily performance of the GPM product in the rainy season with low rainfall (≤ 50 mm) was better compared to extreme rainfall (≥ 100 mm). In this study, corrected GPM daily RD in the range >100 mm was underestimated. This analysis implied that the GPM IMERG Final Run product on daily and monthly rainfall timescales had strong detection capabilities and provided data support for long-time series investigations on Timor Island. Doi: 10.28991/CEJ-2024-010-12-09 Full Text: PDF
Stability Analysis of Dam with Asphalt Core in Static and Pseudo-Static Conditions Krisnayanti, Denik Sri; Sir, Tri M. W.; Hangge, Elsy E.; Megonondo, Batara Doa; Klau, Ralno R.; Galla, Andrea Z.
Civil Engineering Journal Vol. 11 No. 6 (2025): June
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2025-011-06-024

Abstract

Manikin Dam was constructed to address the issue of raw water shortage in Kupang Regency and Kupang City. However, there were challenges due to clay materials that did not meet the required specifications. Therefore, this study aimed to use asphalt core design as an alternative by analyzing the stability of the embankment body under both static and pseudo-static conditions. To achieve the aim, the Bishop method was applied using the GeoStudio SLOPE/W application, along with manual calculations. The results showed that the safety factor (SF) at the end of construction without seismic loads met the minimum value of 1.300. Under various water level conditions (FWL, NWL, LWL), SF consistently met the minimum required value of 1.500. Furthermore, the seismic analysis considered both operational base earthquakes (OBE) with a return period of 100 years and maximum design earthquakes (MDE), which had a return period of 5,000 years. Even under OBE and MDE seismic loading conditions, SF exceeded the minimum required value. This implied that the use of an asphalt core could be considered safe in terms of preventing potential landslides under both static and pseudo-static conditions. Based on this outcome, asphalt core became a practical alternative for future dam construction, particularly in areas where clay could be scarce or unstable for technical reasons.
Co-Authors A. Nursyam, Nurul Alvine C. Damayanti Alvine C. Damayanti Alvine C. Damayanti Alvine Cinta Damayanti Ananda, Yokti Anang Galang Anargi Djalil Mangu Andi H. Rizal Andi Kumalawati Chrystin Chandra Chrystin Chandra Costandji Nait Dantje A. T. Sina Davianto F. Welkis Davianto Frangky B. Welkis Davianto Frangky B. Welkis Decaprio, Alex Demonsa Bintang Putra Lende Djoko Legono Djoko Legono Dolly W. Karels Elia Hunggurami Eugenius Nino Mbauth Fery Moun Hepy Forisman R. Nomnafa Galla, Andrea Z. Hamdan Nurdin Hangge, Elsy E. Henry Jefrison Benu I Made Udiana I Made Udiana I Made Udiana Jacob Kedoh John H. Frans John Hendrik Frans Jordy Georgia Makunimau Judi K Nasjono Judi K. Nasjono Jusuf J. S. Pah Khaerudin, Dian Noorvy Klau, Ralno R. Klau, Ralno Robson Lomi, Desinta Banni M. Solichin Maulana, Mahendra Andiek Megonondo, Batara Doa Mirnawati S Pasoa Munaisyah, Farah Nichorids S Saudale Pah, Jusuf J.S Partogi H. Simatupang, Partogi H. Pasoa, Mirnawati S Philipi de Rozari Remigildus Cornelis Rohi D. Radja Pono Rosmiyati A Bella Ruslan Ramang Ruslan Ramang SATRIYAS ILYAS Seran, Yustinus A. Sereh, David Peterson Sri Wahyuni Suhardjono Suhardjono Syamsumarlin, . Taopan, Angelio A Tatas, Tatas Tri M. W. Sir Tri M.W. Sir Tri M.W. Sir Very Dermawan Vilkanova C. Garu Wilhelmus Bunganaen Wilhelmus Bunganaen Wilhelmus Bunganaen Wilhelmus Bunganaen Wilhelmus Bunganaen Wilhelmus Bunganaen Wilis, Kezia Georginia Patricia Willem Sidharno Yerison Dimu Ratu Yunita A. Messah Yustinus Akito Seran