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The effect of vegetation on the stream bank erotion of Shatt Al-Arab River, South Iraq | ||
| Marsh Bulletin | ||
| Article 1, Volume 5, Issue 1, 2010, Pages 1-13 PDF (0 K) | ||
| Authors | ||
| J.C.H. AL; ; Maliki and A.A.Alrubaye; N.K.M. AL | ||
| Abstract | ||
| Khora, Hamdan and Abu-Flus have been selected to determine the root length density on Shatt Al-Arab River bank . The types of vegetation are murran (Paniam repens ), bardi (Typha domingensis)and khwesa (Vallisneria spiralis) .Natural moisture content, weight density , plasticity index, shrinkage limit , grain size distribution and Maximum Shear resistance were determined . Besides the erodibility coefficient and erosion rate, the shear stress of flow on the bank toe and safety factor of the bank stability were calculated for the period between October 2007 to December 2008. The results showed that there are noticeable variations in geotechnical properties between the sites that chosen for this study . Also, this study proved that the root length density values in the bank toe are 0.049-0319 cm.cm-3 , 0.147-0.516 cm.cm-3 and 0.221-0.688 cm.cm-3 for murran , bardi and khwesa plants respectively. The values of maximum shear resistance caused by the roots are 9.0 - 20.0 Pa , 14.0 - 29.0 Pa and 20.0 -37.0 Pa in soil vegetated by murran , bardi and khwesa plants respectably ,while this values in the unvegetated soils was 4.2 Pa , 9.0 Pa and 8.0 Pa in site 1, site 2 and site 3 respectively.The safety factor of soil reached up to 1.29 , 1.67 and 1.89 in soils that vegetated by murran , bardi and khwesa plants respectively, while these values in all of unvegetated soil were below the 1.00 unite. The results of this study have concluded that the density and distribution of roots within a River bank play an important role in River bank erosion and stability, and the shear resistance of cohesive soils that vegetated by plants can not be a unique criterion for erodibility estimation, also the cohesion that measured by Coulomb equation in vegetated soils is not represented the true cohesion of soil, but it is apparent (true cohesion combined with additional cohesion by roots ). | ||
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