Electronic Theses and Dissertation

Ruas Jalan Nasional Lamno – Aceh Jaya, Kecamatan Sampoiniet, Kabupaten Aceh Jaya, telah mengalami insiden kehilangan kendali kendaraan akibat lapisan air pada perkerasan saat hujan deras, menegaskan urgensi kajian risiko aquaplaning di ruas ini. Penelitian bertujuan mengkaji pengaruh variasi intensitas hujan terhadap risiko aquaplaning pada perkerasan lentur di segmen STA 86+000–STA 86+300. Intensitas hujan durasi 1 jam pada ruas ini berkisar 33,84–58,65 mm/jam untuk periode ulang 2–100 tahun, berdasarkan analisis frekuensi data curah hujan tahun
2000–2019. Analisis Topographic Wetness Index (TWI) berbasis Digital Elevation Model (DEM) hasil survei fotogrametri UAV menunjukkan nilai TWI antara -0,029 hingga 4,906, dengan STA 86+050 dan STA 86+100 sebagai titik paling berpotensi mengalami akumulasi air. Ketebalan lapisan air yang dihitung menggunakan rumus RRL menghasilkan nilai 0,587–1,484 mm, tergolong risiko sangat rendah hingga rendah. Namun, tingkat risiko aquaplaning tidak hanya ditentukan oleh ketebalan lapisan air, tetapi juga oleh kecepatan kritis dan karakteristik kendaraan, perbandingan kecepatan kritis (persamaan Horne dan Dreher) dengan batas kecepatan jalan (80 km/jam) menunjukkan kendaraan ringan (91,19 km/jam) tergolong risiko sedang, sedangkan kendaraan berat (148,92 km/jam) tergolong risiko rendah. Perbedaan ini menegaskan bahwa risiko aquaplaning dipengaruhi oleh karakteristik kendaraan, khususnya tekanan ban, sebagaimana diasumsikan dalam metode penelitian (30 psi kendaraan ringan, 80 psi kendaraan berat), sehingga kendaraan ringan menjadi kelompok yang relatif lebih rentan mengalami aquaplaning pada ruas jalan penelitian.

The Lamno–Aceh Jaya National Road, Sampoiniet Sub-district, Aceh Jaya Regency, has experienced vehicle loss-of-control incidents caused by a water film on the pavement surface during heavy rainfall, underscoring the urgency of assessing aquaplaning risk on this road segment. This study aims to examine the effect of rainfall intensity variation on aquaplaning risk on flexible pavement in the segment STA 86+000–STA 86+300. The 1-hour rainfall intensity for this segment ranges from 33.84 to 58.65 mm/hour for return periods of 2–100 years, based on frequency analysis of rainfall data from 2000–2019. Topographic Wetness Index (TWI) analysis based on a Digital Elevation Model (DEM) derived from a UAV photogrammetric survey shows TWI values ranging from -0.029 to 4.906, with STA 86+050 and STA 86+100 identified as the points most prone to water accumulation. The water film thickness, calculated using the RRL formula, ranges from 0.587 to 1.484 mm, classified as very low to low risk. However, aquaplaning risk is determined not only by water film thickness but also by critical speed and vehicle characteristics; comparison of critical speed (using the Horne and Dreher equations) with the road speed limit (80 km/h) shows that light vehicles (91.19 km/h) fall into the moderate-risk category, while heavy vehicles (148.92 km/h) fall into the low- risk category. This difference confirms that aquaplaning risk is influenced by vehicle characteristics, particularly tire pressure, as assumed in the research method (30 psi for light vehicles, 80 psi for heavy vehicles), making light vehicles the group relatively more vulnerable to aquaplaning on the studied road segment.