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All Journal Journal of Civil Engineering and Vocational Education
Junaidi
Civil Engineering, Faculty of Engineering, Universitas Andalas, Indonesia
Civil Engineering, Building, Construction & Architecture Education Engineering Environmental Science Transportation

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The Effect of Elevation Differences on the Estimation of Plant Evapotranspiration in the Kuranji Watershed Anastasia Catur Lestari; Darwizal Daoed; Nurhamidah; Junaidi
CIVED Vol. 12 No. 1 (2025): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/cived.v12i1.707

Abstract

This study compares evapotranspiration (ETo) values obtained from direct field observations with estimates from empirical models at different elevation. The empirical models used are Modified Penman, Penman-Monteith, Blaney-Criddle, Hargreaves, and Radiation. This research was conducted in the Batang Kuranji Watershed, specifically in Pauh Subdistrict (174 m above sea level) and Nanggalo Subdistrict (18 m above sea level), from August 6th to August 31st, 2023. Daily temperature, humidity, wind speed, and solar radiation data, collected using Thermo-Pro devices and from relevant agencies, were used as input for the empirical models. Three field experiments were carried out in the form of: evaporation plots, evapotranspiration plots without infiltration influence, and evapotranspiration plots with infiltration influence. Furthermore, the observed ETo values in the field were 90.67 mm/month in Nanggalo and 90.00 mm/month in Pauh. The empirical models produced estimates comparable to field observations. Analysis of the coefficient of determination (R²) revealed that the Modified Penman empirical model was the most suitable with field experiments and showed a very strong relationship (R² = 0.96). The results of this study can be used as a basis for managing rice irrigation water and developing better ETo prediction models, especially in the Batang Kuranji Watershed. The authors identify areas needing further research to enable the model's use for calculating evaporation across an entire growing season.
Land Use Changes in Batang Suliti Watershed using ArcGIS Robby Eldy Eka Putra; Junaidi; Andriani
CIVED Vol. 12 No. 1 (2025): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/cived.v12i1.722

Abstract

The ArcGIS application can process satellite imagery data into a land use map and calculate the area of each land use type. This study analyzes land use changes in the Batang Suliti watershed from 2013 to 2022 using ArcGIS. The study employs supervised classification and cloud masking techniques to enhance accuracy. The results indicate that forest area decreased by 4.47% with an annual change rate of 0.50%, followed by a 2.55% reduction in rice fields, while residential areas increased by 1.21%. These changes are mainly driven by population growth and agricultural expansion. The findings highlight the need for sustainable land use management policies to mitigate environmental degradation in the watershed.
Co-Authors Anastasia Catur Lestari Andriani Daoed, Darwizal Nurhamidah Robby Eldy Eka Putra