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JARING ARUS

JARING ARUS. Adhi Muhtadi, ST, SE, MSi. Jaring arus. Sekelompok garis aliran & garis ekipotensial Garis ekipotensial: garis2 yg punya tinggi energgi potensial yg sama (h konstan) Gbr 3.25 hal 202: contoh jaring arus pd struktur turap baja

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JARING ARUS

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  1. JARING ARUS Adhi Muhtadi, ST, SE, MSi.

  2. Jaringarus • Sekelompok garis aliran & garis ekipotensial • Garis ekipotensial: garis2 yg punya tinggi energgi potensial yg sama (h konstan) • Gbr 3.25 hal 202: contoh jaring arus pd struktur turap baja • Permeabilitas lap lolos air dianggap isotropis (kx = kz = k) • Garis penuh = garis aliran; garis putus2 = garis ekipotensial

  3. PQ dan TU adalah gs ekipotensial • QRST dan VW : grs aliran • Garis aliran & grs ekipotensial digbrkan scr coba2 • Prinsip dasar: grs aliran dan grs ekipotensial berpotongan tgk lurus

  4. Bilaperpotgrsaliran & grsekipotensialberbentukbujursangkar: • Δq = k . Δh • Gradien hidrolik diberikan menurut persamaan: i= Δh / Δl ; • Δh = h/Nd ; h = beda tinggi energi antara grs ekipotensial awal dan akhir ; Nd = jum penurunan dr grs ekipotensial

  5. Hitunganrembesandgncarajaringarusdlmstruktur bang air (bendungan): • Lihat gbr 3.26 hal 203 • Lajur aliran : ruang memanjang yg terletak diantara 2 grs aliran yg berdekatan • Utk menghit rembesan ditinjau lajur2 aliran pd gbr 3.27 hal 204 • Grs2 ekipotensial memotong grs aliran dgn tinggi h • Debit Δq: aliran yg lewat 1 lajur aliran per satuan lebar struktur bendung

  6. Hukum Darcy: • Dlm 1 lajur aliran : Δq = k . i . A = k . (h1 - h2) . (b1 x 1) / l1 = k . (h2 - h3) . (b2 x 1) / l2 = k . (h3 - h4) . (b3 x 1) / l3 = …………..

  7. Jika elemen2 jaring arus digambarkan spt bujur sangkar:l1 = b1 ; l2 = b2 ; l3 = b3….dst • Maka: h1-h2 = h2-h3 = h3-h4 = ……. = Δh = h / Nd ---> kehilangan tinggi energi antara 2 grs ekipotensial yg berurutan adl sama : Δq = k . h/Nd • Jika tdp Nf lajur aliran, debit rembesan (q)per satuan lebar dr struktur : q = Nf . Δq = k.h.Nf/Nd

  8. Jaring arus ~~~ berbentuk segi empat • Nilai banding panjang dan lebar dari elemen jaring arus hrs konstan b1/l1 = b2/l2 = b3/l3 = ………=n • Utk jaring arus segi empat, utk 1 lajur aliran, debit rembesan per satuan lebar dan struktur ditentukan oleh: Δq = k . Δh . n= k. (h/Nd) . n • Bila jaring arus tdp Nf lajur aliran, mk debit rembesan: q = k.h.(Nf/Nd). n

  9. Dilanjutkanketekananrembesan……….

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