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Çѱ¹¼öÀÚ¿øÇÐȸ / v.45, no.2, 2012³â, pp.137-149
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½Ä»ýÇÏõÀÇ ÇöÀåÀڷḦ ÀÌ¿ëÇÑ Á¶µµ°è¼ö °ü°è½Ä À¯µµ
( Derivation of Roughness Coefficient Relationships Using Field Data in Vegetated Rivers ) |
| ÀÌÁ¾¼®;;±èÀçÈÆ;ÀÌÅ¿ì; Çѹç´ëÇб³ Åä¸ñ°øÇаú;Äݷζ󵵴ëÇб³(CSU) Åä¸ñȯ°æ°øÇаú;Äݷζ󵵴ëÇб³(CSU) Åä¸ñȯ°æ°øÇаú;»óÁö¿£Áö´Ï¾î¸µ(ÁÖ);
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| º» ¿¬±¸´Â È帧 ÀúÇ׿¡ ´ëÇÑ ºÐ¼®À» À§ÇØ Ãʺ» 281°³, °ü¸ñ 150°³, ±³¸ñ 308°³ÀÇ ÇöÀå½ÇÃø ÀÚ·á·Î ±¸¼ºµÈ 739°³ ½Ä»ýÇÏõÀ» ´ë»óÀ¸·Î ¼öÇàµÇ¾ú´Ù. ½ÇÃøÀÚ·áÀÇ Manning Á¶µµ°è¼ö ºÐÆ÷´Â Ãʺ»ÀÚ·á¿¡¼ 0.015~0.250, °ü¸ñÀÚ·á¿¡¼ 0.016~0.250, ±³¸ñÀÚ·á¿¡¼ 0.018~0.310ÀÇ ¹üÀ§¸¦ °®´Â´Ù. À̵é Á¶µµ°è¼öÀÇ Áß¿äÇÑ ºÐÆ÷°æÇâÀº Darcy-Weisbach (¶Ç´Â ManningÀÇ Á¶µµ°è¼ö)¿Í À¯·®, ¸¶Âû°æ»ç ¹× »ó´ë Àá¼öºñ¿¡ ´ëÇÑ °ü°è½ÄÀ¸·Î Á¦½ÃÇÏ¿´´Ù. ½Ä»ýÇÏõ¿¡¼ Darcy-Weisbach¿Í Manning Á¶µµ°è¼ö¿¡ °üÇÑ È¸±Í ¹æÁ¤½ÄÀº $f_{veg}=0.436Q^{-0.363}$, $f_{veg}=3.305S_f^{0.508}$¿Í $n_{veg}=0.061Q^{-0.124}$, $n_{veg}=0.144S_f^{0.199}$ ¹× $V=5.3(h/d_{50})^{1/8.3}{sqrt{ghS_f}}$, $sqrt{8/f}(=V/u_*)=5.75log(5h/d_{50})$·Î À¯µµµÇ¾ú´Ù. ÀÌµé ¹Ý °æÇèÀû °ü°è½ÄÀº ¼ö°ø ½Ç¹«¿¡¼ À¯¿ëÇÏ°Ô »ç¿ëµÉ °ÍÀÌ´Ù. |
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| Field measurements of resistance to flow are analyzed for 739 rivers vegetated with grass (281 channels), shrubs (150 channels) and trees (308 channels). The measured distribution of Manning roughness coefficients ranges from 0.015~0.250 for grass, 0.016~0.250 for shrubs, 0.018~0.310 for trees. Significant trends are obtained between Darcy-Weisbach (or Manning roughness coefficients) and flow discharge, friction slope, and relative submergence. The regression equations for Darcy-Weisbach and Manning roughness coefficients in vegetated rivers are: $f_{veg}=0.436Q^{-0.363}$, $f_{veg}=3.305S_f^{0.508}$, and $n_{veg}=0.061Q^{-0.124}$, $n_{veg}=0.144S_f^{0.199}$, $V=5.3(h/d_{50})^{1/8.3}{sqrt{ghS_f}}$, $sqrt{8/f}(=V/u*)=5.75log(5h/d_{50})$, respectively. These semi-empirical relationships should be useful for hydraulic engineering practice. |
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| ½Ä»ýÇÏõ;Á¶µµ°è¼ö;»ó´ë Àá¼öºñ;Á¶µµ°è¼ö °ü°è½Ä;¹Ý °æÇèÀû °ü°è½Ä;vegetated rivers;roughness coefficients;relative submergence;roughness coefficient relationships;semi-empirical relationships; |
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Çѱ¹¼öÀÚ¿øÇÐȸ³í¹®Áý / v.45, no.2, 2012³â, pp.137-149
Çѱ¹¼öÀÚ¿øÇÐȸ
ISSN : 1226-6280
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO201208636392910)
¾ð¾î : Çѱ¹¾î |
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| ³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø |
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