PENYUSUNAN MODEL KONSEPTUAL HUBUNGAN ANTARA PROSES LIMPASAN DENGAN PENCUCIAN UNSUR HARA

Nani Heryani

doi:10.32679/jsda.v9i1.361

PENYUSUNAN MODEL KONSEPTUAL HUBUNGAN ANTARA PROSES LIMPASAN DENGAN PENCUCIAN UNSUR HARA

Nani Heryani

Abstract

Model konseptual hubungan proses aliran air dengan ketersediaan air dalam DAS hanya mencakup proses di dalam DAS yang memengaruhi kimia air atau yang memberi pertanda kimia dalam aliran. Penelitian dilakukan di DAS mikro Cakardipa, DAS Ciliwung Hulu, Jawa Barat. Tujuan penelitian yaitu menyusun model konseptual hubungan antara proses limpasan atau aliran air dengan ketersediaan air dan pencucian hara. Penelitian dilakukan melalui beberapa tahapan yaitu: pemasangan jaringan alat pengamatan hidrokimia dan hidrometrik, analisis separasi hidrograf secara geokimia dan hidrometrik, analisis dinamika aliran bawah permukaan, analisis hubungan konsentrasi unsur hara (hidrokimia) dan debit. Berdasarkan hasil-hasil analisis tersebut disusun model konseptual hubungan antara proses aliran air dengan ketersediaan air di dalam DAS dan pencucian hara. Hasil penelitian menunjukkan bahwa berdasarkan separasi hidrograf secara geokimia terdapat kontribusi air tanah (groundwater) sebesar 47,3%, air lahan(soil water) sebesar 28,0%, dan curah hujan sebesar 24,7%, sedangkan separasi hidrograf secara hidrometrik menunjukkan bahwa dengan curah hujan sebesar 46,5 mm selama 8 jam 35 menit menghasilkan debit dengan volume sebesar 2.377 m3. Potensial air dan jalur aliran tempat air mengalir juga memengaruhi perbedaan konsentrasi kimia air yang melalui lereng hingga ke sungai. Akumulasi unsur hara cenderung tinggi pada bagian hilir DAS. Hubungan antara konsentrasi unsur kimia air dengan debit adalah linier, dalam hal ini terjadi penurunan unsur hara pada saat terjadi peningkatan debit.

Keywords

Limpasan, kimia air, debit, pencucian hara, model konseptual

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DOI: https://doi.org/10.32679/jsda.v9i1.361