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All Journal Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (Journal of Natural Resources and Environmental Management)
I Putu Gede Eka Handrayana Putra
Department of Aquatic Resources Management, Faculty of Marine Science and Fisheries, Udayana University
Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences Environmental Science

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Comparative Delineation Methods and Ecological Quality Assessment of Riparian Zones in the Downstream Ayung River, Bali I Kade Alfian Kusuma Wirayuda; I Putu Gede Eka Handrayana Putra; Pratama Made Dendy; Moh Saifulloh
Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (Journal of Natural Resources and Environmental Management) Vol 16 No 5 (2026): Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (JPSL)
Publisher : Pusat Penelitian Lingkungan Hidup, IPB (PPLH-IPB) dan Program Studi Pengelolaan Sumberdaya Alam dan Lingkungan, IPB (PS. PSL, SPs. IPB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jpsl.16.5.644

Abstract

Riparian zones are transitional areas between aquatic and terrestrial ecosystems. They play a very important ecological role in both ecosystems. The accuracy of ecological assessments of riparian zones fundamentally depends on how riparian boundaries are delineated. Current policies rely on strict, fixed buffer zones, which lead to generalization. This study evaluates how boundary sensitivity affects the Riparian Strip Quality Index (RSQI). This study compares three delineation methods (Upland Terrace, Fixed-width buffer, and slope-based) in the downstream Ayung River, Bali. Statistical analysis indicated that the delineation method affected the ecological assessment outcomes (η² = 0.49). The fixed-width buffer delineation method tends to underestimate riparian quality by including non-contributing built-up areas (27.23%). In contrast, the Upland Terrace method shows more ecologically representative results and has no significant score difference with slope-based delineation (Wilcoxon Z = -0.75). RSQI evaluations showed significant spatial variability. It also indicated local degradation in urbanized segments (RSQI dropping to 50.09–59.77 in Segments 1 and5), and pristine environmental quality where segments are dominated by natural vegetation (RSQI = 94.41 in Segment 9). These findings show the disadvantages of current regulations that use a generalized delineation method. To improve urban river management, policymakers need to consider a transition to geomorphology-based boundary delineations and carry out targetedrestoration in degraded areas.
Co-Authors I Kade Alfian Kusuma Wirayuda Moh Saifulloh Pratama Made Dendy