Perubahan Kapasitas Simpan Air Di Kota Tarakan Kalimantan Utara

Abstract

Abstrak. Nilai kapasitas simpan air menentukan jumlah air yang tersedia di dalam tanah untuk mendukung kegiatan pertanian khususnya wilayah Kota Tarakan. Tanaman akan mengalami gangguan pertumbuhan dan penurunan produktivitas jika mengalami kekurangan air. Penelitian ini bertujuan untuk menganalisis perubahan kapasitas simpan air berbasis neraca air dan perubahan tata guna lahan di wilayah Kota Tarakan periode 2005- 2020. Prosedur penelitian terdiri dari beberapa tahapan yaitu analisis perubahan tata guna lahan, analisis neraca air dan analisis kapasitas simpan air. Hasil penelitian menunjukkan terjadinya peningkatan nilai surplus sebesar 44,26 mm dan limpasan sebesar 59,47 mm. Namun nilai pengisian air tanah mengalami penurunan sebesar 15,21 mm. Nilai kapasitas simpan di wilayah Kota Tarakan selama periode 2005-2020 menunjukkan penurunan sebesar 7,57 mm yaitu 130,35 mm pada tahun 2005 dan 122,78 mm pada tahun 2020. The Changes Of Water Storage Capacity In Tarakan City Of North Kalimantan Abstract. The value of water storage capacity determines the amount of water available in the soil to support agricultural activities, especially in Tarakan City area. The plants will experience growth disorders and decrease their productivity if they captivate lack of water. This study aimed at analyzing the changes in water storage capacity based on water balance and the changes in land use in Tarakan City area for the period 2005-2020. The procedure of this study consisted of several stages, namely land-use change analysis, water balance analysis, and water storage capacity analysis. The results of data analysis showed that the surplus-value increased by 44.26 mm and the water runoff enlarged by 59.47 mm. However, the groundwater recharging value decreased by 15.21 mm. The value of water storage capacity in Tarakan City area during the period 2005-2020 showed a decrease of 7.57 mm, namely 130.35 mm in 2005 and 122.78 mm in 2020.

Keywords

• evapotranspirasi
• kapasitas simpan air
• neraca air
• presipitasi
• tata guna lahan
• , water storage capacity
• water balance
• precipitation
• land use