Electronic Theses and Dissertation

Kualitas air sangat krusial bagi keberlangsungan makhluk hidup dan stabilitas ekosistem. di kawasan daerah aliran sungai (das) krueng baro, pidie, aktivitas manusia seperti pemukiman, pertanian, dan industri rumah tangga diduga telah menurunkan mutu air sungai tersebut. oleh karena itu, penelitian ini dilakukan untuk menganalisis fluktuasi kualitas air berdasarkan perubahan musim (hujan dan kemarau) serta menentukan penyebab utama penurunan kualitas air di wilayah tersebut. metode yang digunakan untuk menentukan kualitas air pada penelitian ini adalah metode national sanitation foundation-water quality index (nsf-wqi). data yang digunakan dalam penelitian ini adalah data sekunder berupa data penelitian laboratorium kualitas air sungai krueng baro dari balai wilayah sungai sumatera-i. parameter yang digunakan adalah parameter fisika, kimia dan biologi yang diambil dari beberapa lokasi yang mewakili hulu, tengah dan hilir das krueng baro pidie. parameter uji kualitas air sungai krueng baro mengacu pada peraturan pemerintah nomor 22 tahun 2021 tentang proses penyelenggaraan perlindungan dan pengelolaan lingkungan hidup. berdasarkan analisis kualitas air das krueng baro kabupaten pidie periode 2019–2024 menggunakan metode nsf-wqi, diketahui bahwa kualitas air dipengaruhi secara signifikan oleh variasi musim dan lokasi. nilai rata-rata indeks kualitas air pada musim kemarau sebesar 51,83 termasuk kategori sedang, sedangkan pada musim hujan menurun menjadi 47,36 dan tergolong buruk. secara spasial, kualitas air di bagian hulu relatif lebih baik (50,53) dibandingkan bagian tengah (48,84) dan hilir (49,80). kualitas air yang lebih buruk di bagian tengah disebabkan oleh tingginya aktivitas antropogenik, seperti pemukiman padat dan limpasan pertanian, serta kecepatan aliran yang lebih rendah sehingga memungkinkan akumulasi polutan. sebaliknya, di bagian hilir terjadi proses pengenceran alami akibat peningkatan debit dan kontribusi aliran anak sungai. penurunan kualitas air terutama dipicu oleh meningkatnya kekeruhan, nilai bod hingga 6,7 mg/l, serta kontaminasi fecal coliform mencapai 9.200 jml/100 ml yang melampaui baku mutu pp ri no. 22 tahun 2021. temuan ini menegaskan bahwa tekanan aktivitas manusia dan dinamika hidrologi musiman merupakan faktor kunci penentu kualitas air das krueng baro.

Water quality is crucial for the survival of living things and the stability of ecosystems. In the Krueng Baro River Basin (DAS) in Pidie, human activities such as settlements, agriculture, and household industries are suspected to have reduced the quality of the river water. Therefore, this study was conducted to analyze fluctuations in water quality based on seasonal changes (rainy and dry seasons) and to determine the main causes of water quality decline in the area. The method used to determine water quality in this study was the National Sanitation Foundation-Water Quality Index (NSF-WQI) method. The data used in this study was secondary data in the form of laboratory research data on the water quality of the Krueng Baro River from the Sumatra-I River Basin Agency. The parameters used were physical, chemical, and biological parameters taken from several locations representing the upstream, middle, and downstream areas of the Krueng Baro Pidie watershed. The Krueng Baro river water quality test parameters refer to Government Regulation No. 22 of 2021 concerning the process of Environmental Protection and Management. Based on the analysis of the water quality of the Krueng Baro watershed in Pidie Regency for the period 2019–2024 using the NSF-WQI method, it is known that water quality is significantly influenced by seasonal and location variations. The average water quality index value in the dry season was 51.83, which is classified as moderate, while in the rainy season it decreased to 47.36 and was classified as poor. Spatially, water quality in the upstream section is relatively better (50.53) than in the middle (48.84) and downstream (49.80) sections. The poorer water quality in the middle section is due to high anthropogenic activities, such as dense settlements and agricultural runoff, as well as lower flow velocity, which allows for the accumulation of pollutants. Conversely, in the downstream section, natural dilution occurs due to increased discharge and the contribution of tributaries. The decline in water quality is mainly triggered by increased turbidity, BOD values of up to 6.7 mg/L, and fecal coliform contamination reaching 9,200 Jml/100 mL, which exceeds the quality standards of PP RI No. 22 of 2021. These findings confirm that human activity pressure and seasonal hydrological dynamics are key factors determining water quality in the Krueng Baro watershed.