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All Journal Jurnal Sains Teknologi dan Lingkungan (JSTL) Jurnal Manajemen Aset Infrastruktur dan Fasilitas GANEC SWARA Spektrum Sipil SADE Jurnal Arsitektur, Planologi dan Teknik Sipil PORTAL ABDIMAS
Salehudin Salehudin
Fakultas Teknik, Jurusan Teknik Sipil, Universitas Mataram
Agriculture, Biological Sciences & Forestry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Engineering Environmental Science Law, Crime, Criminology & Criminal Justice Library & Information Science Mathematics Public Health Social Sciences Transportation

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Journal : Jurnal Sains Teknologi dan Lingkungan (JSTL)

 1 
Variasi Penempatan Bronjong Di Hilir Kolam Olak Terhadap Pola Gerusan Dasar: Variations in the Placement of Gabions in the Downstream of the Pool Against Basic Scouring Pattern I Dewa Gede Jaya Negara; Salehudin Salehudin; Lilik Hanifah; I Wayan Yasa; Ni Putu Ira Sintia Kurnianti
JURNAL SAINS TEKNOLOGI & LINGKUNGAN Vol. 8 No. 1 (2022): JURNAL SAINS TEKNOLOGI & LINGKUNGAN
Publisher : LPPM Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jstl.v8i1.300

Abstract

The existence of a weir is often disrupted by the occurrence of scouring downstream, which results in an insecure weir position. This study aims to determine the effect of installation of gabion variations downstream of stilling ponds on the depth and length of scour at the bottom of the channel. The test was carried out at the Hydrology and Coastal Laboratory of FT Unram in a straight channel with dimensions of 7.5 m x 0.55 m x 0.5 m, with an Ogee type spillway and a USBR Type III stilling pond. The dimensions of the test gabions are 0.55 m x 0.18 m x 0.09 m with a gravel diameter of 1 (P1 ) 0.035 m, (P2 ) 0.0175 m and (P3 )0.00875 m, and the variation of discharge 1(Q1) 0.0019 m3/s, discharge 2(Q2) 0.0036 m3/s, discharge 3 (Q3) 0.0047 m3/s and discharge 4 (Q4) 0.0065 m3/s. The results showed that in conditions without gabions, scour was prone to occur near the end of the stilling pond to the center of the channel bottom and towards the right side of the channel, with a scour depth of 0.002m – 0.023m and a length of 0.075m – 0.45m. For conditions with gabions, the scour length ranges from 0.15m – 0.275m with a depth of 0.0016m – 0.026 m, the scour occurs more evenly to the left and right of the channel.  
Dampak Perubahan Tata Guna Lahan dan Implikasinya terhadap Besaran Debit Banjir pada Kawasan Ekonomi Khusus (KEK) Mandalika: Impact of Land Use Change and its Implications for Flood Discharge in the Mandalika Special Economic Zone (SEZ) Muh Bagus Budianto; Bambang Harianto; Salehudin Salehudin; Hartana Hartana; Syamsul Hidayat
JURNAL SAINS TEKNOLOGI & LINGKUNGAN Vol. 8 No. 2 (2022): JURNAL SAINS TEKNOLOGI & LINGKUNGAN
Publisher : LPPM Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jstl.v8i2.334

Abstract

Land use change is one of the factors that affect changes in flood discharge in watersheds. Currently, the Mandalika Resort area has been designated as a Special Economic Zone (SEZ) so that large-scale development occurs in the Mandalika area with an area of 1,035.67 Ha. The purpose of this study was to determine the effect of changes in land use at the Mandalika resort on flood discharge in the watersheds in the Mandalika SEZ, namely the Balak, Ngolang and Tabelo watersheds. The data used are rainfall data, watershed maps and land use. Rainfall data is needed for analysis of hourly rainfall distribution, the method used is the Alternating Block Method (ABM). Land use maps and their changes are used to obtain Curve Number (CN) values. These parameters are used as input into the HEC-HMS software. The results of the analysis show that changes in land use have caused the CN value of the Balak watershed to increase by 1,33% in 2030 and increase by 3,72% in 2045, the CN value of the Ngolang watershed increase by 3,24% in 2030 and increase by 6,49% in 2045 and the value of the CN DAS Tableo will increase by 0,12% in 2030 and increase by 0,59% in 2045. Changes in land use have also resulted in an increase in flood discharge at various return periods. In the Balak watershed it will increase by an average of 1,76% in 2030 and 4,94% in 2045, the flood discharge in the Ngolang watershed will increase by an average of 4,00% in 2030 and 8,67% in 2045 and in the Tebelo watershed it will increase by an average 0,17% in 2030 and 0,79% in 2045.
Kemampuan Penyerapan dan Reduksi Lengas Tanah Pada Media Polybag Kombinasi Tanah dan Kompos: Soil Moisture Absorption dnd Reduction Capability In Polybag Media Combination of Soil and Compost I Dewa Gede Jaya Negara; Salehudin Salehudin; Suparjo Suparjo; Anid Supriyadi; Humairo Saidah; Lalu Dwiki Axela Andriawan
JURNAL SAINS TEKNOLOGI & LINGKUNGAN Vol. 9 No. 2 (2023): JURNAL SAINS TEKNOLOGI & LINGKUNGAN
Publisher : LPPM Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jstl.v9i2.447

Abstract

Soil moisture is an important factor needed by plants for growth, and therefore the amount of soil moisture that can be stored depends on the type of soil or the composition of the soil-forming materials. Compost is one of the nutrients that is often used in the manufacture of planting media on land in the form of polybags, and the amount of compost composition on the soil is thought to greatly affect the ability to store water in the media. This study aims to test drip irrigation on a mixture of compost and soil on storage of irrigation water. Tests were carried out at a ratio of 70%: 30%, 50%: 50% and 30%: 70%. Irrigation was tested at a duration of 5 minutes, 10 minutes, and 15 minutes, and the data analyzed included irrigation distribution data, discharge, soil moisture data (w) and daily soil moisture change data. The results of the analysis are presented in the form of tables and graphs, then discussed and concluded descriptively. The results of the analysis show that the flow rate obtained is greater if the difference in water level to the land is greater, and the average Cu value obtained is 95.79% which is very good. With initial soil moisture in the range of 19%-25, soil moisture gain obtained by drip irrigation for 5 minutes -10 minutes is around 12%, and for a duration of 15 minutes soil moisture gain is obtained by 8% -21%. The lowest recharge was obtained on land with 30% soil and 70% compost of 8%-12%. The amount of soil moisture reduction after 24 hours of irrigation test was 6% - 17%, the lowest reduction was at 70% compost and 30% soil around 6%.
Co-Authors Anid Supriyadi ANID SUPRIYADI Bambang Harianto Didi S. Agustawijaya Hartana Hartana Hasyim, Hasyim Heri Sulistiyono Hidayat, Syamsul Humairo Saidah I DEWA GEDE JAYA NEGARA I Dewa Gede Jaya Negara I Gde Putu Warka I Wayan Suteja I WAYAN YASA I Wayan Yasa I.B. Giri Putra IAO Suwati Sideman Lalu Dwiki Axela Andriawan Lalu Wirahman Lilik Hanifah Made Mahendra Muh Bagus Budianto Ni Putu Ira Sintia Kurnianti Nurun Ainudin Rohani Suparjo Suparjo Suryawan Murtiadi Suryawan Murtiadi Syamsul Hidayat Yusron Saadi