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TS Transpor Polutan - istiarto

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Konveksi-Difusi<br />

dalam Regime Turbulen<br />

• Koefisien difusi vertikal<br />

<br />

tz<br />

u<br />

<br />

z<br />

h<br />

<br />

h <br />

z<br />

• Koefisien difusi vertikal<br />

rata-rata kedalaman<br />

tz 0, 067<br />

• Difusi vertikal mencapai seluruh kedalaman<br />

setelah difusi mencapai jarak L z tertentu atau<br />

setelah waktu t z tertentu, dimana<br />

L<br />

z<br />

<br />

z<br />

U<br />

h<br />

<br />

2<br />

tz<br />

t<br />

z<br />

<br />

kecepatan ratarata<br />

kedalaman<br />

z<br />

h<br />

<br />

2<br />

tz<br />

Teknik Sungai <strong>Transpor</strong> <strong>Polutan</strong> 4-28<br />

<br />

hu<br />

<br />

<br />

kecepatan geser<br />

kedalaman aliran<br />

= 0,1 jika polutan dimasukkan di<br />

tengah kedalaman aliran<br />

= 0,4 jika polutan dimasukkan di<br />

dasar sungai

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