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INFILTRASI AIR HUJAN – KONDISI AWAL LENGAS TANAH


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INFILTRASI AIR HUJAN   -  KONDISI AWAL LENGAS TANAH
Kapilaritas tanah  yang berhubungan dengan parameter sorptivitas tanah, sangat mempengqaruhi laju infiltrasi air hujan, terutama pada awal curah hujan atau irigasi.
Banyak model matematika yang digunakan untuk memperkirakan sorptivitas tanah  hanya berlaku untuk kondisi tanah kering.

Makalah ini membahas bagaimana sorptivitas tanah  dan komponen kapiler nya (seperti bidang permukaan pembasahan ) berubah dengan tingkat kejenuhan tanah-awal.

Efek ini dianalisis dengan modifikasi sederhana model Green-Ampt untuk sorptivitas tanah.
Model yang dimodifikasi ini memiliki aplikasi praktis: (1) secara akurat menggambarkan sorptivitas relatif tanah pada berbagai kondisi kandungan air tanah; dan (2) memungkinkan untuk kuantifikasi konduktivitas jenuh hidrolik tanah berdasarkan hasil pengukuran sorptivitas , estimasi kurva karakteristik tanah dan kondisi awal lengas tanah.
Aplikasi model ini sangat berguna pada atanah-tanah yang permeabilitasnya rendah, di mana waktu yang diperlukan untuk memperkirakan konduktivitas hidrolik melalui metode steady-state dapat menjadi tidak praktis.
Sumber:  Ryan D. Stewart,  David E. Rupp,  Majdi R. Abou Najm,  John S. Selker. 2013. Modeling effect of initial soil moisture on sorptivity and infiltration.  Water Resources Research.Volume 49, Issue 10, pages 7037–7047, October 2013.

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