Home > Uncategorized > INFILTRASI AIR HUJAN – PROFIL TANAH BERLAPIS

INFILTRASI AIR HUJAN – PROFIL TANAH BERLAPIS

INFILTRASI AIR HUJAN -  PROFIL TANAH BERLAPIS

 

Model infiltrasi berdasarkan asumsi Green-Ampt dikembangkan untuk kelas TANAH- tanah yang tidak-seragam, dimana konduktivitas hidroliknya menurun sebagai fungsi eksponensial dari kedalaman tanah, dan faktor storage-suction dianggap konstan.

Analisis konduktivitas hidrolik dan porositas tanah menunjukkan bahwa model ini mungkin berguna pada beberapa kondisi tanah , di mana perubahan karakteristik hidrolik dengan kedalaman tanah menghikuti  bentuk fungsi ini.

Sebuah metode untuk menerapkan model dengan waktu hujan yang beragam juga telah disusun.

Model ini diterapkan untuk mensimulasikan hasil eksperimen Childs & Bybordi (1969) yang mengukur infiltrasi air hujan ke dalam profil tanah pasir yang berlapis.

Kesesuaian yang cukup baik ditemukan untuk kasus ini.

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PREDIKSI infiltrasi kumulatif  (I) untuk dua tanah dengan KQ = 0,02 m / jam. Garis putus-putus f = -12,0 / m,  garis putus-titik f = – 2,8 / m; garis utuh adalah curah hujan kumulatif.  Panah menunjukkan waktu perkiraan genangan, (a) r = 0,05 m / jam, (b) r = 0,02 m / jam.

 

Sumber: KEITH BEVEN. 1984. Infiltration into a class of vertically nonuniform soils
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