The study area extends from Al-Haymah to south Al-Mokha along Red Sea and covering a distance of about 90 Km along the shore line, Int J Hydro. 2019;3(2):159-173.Ecological risk assessment of heavy metals in coastal sediments between Al-Haymah and Al-Mokha, south red sea, Yemen Abstract The area between Al-Haymah and Al-Mokha on the Red Sea of Yemen is a promising region for future tourism development. It is also characterized by population activities, especially fishing in more than one location and there is a commercial port in Al-Mokha. The aim of the present study is to investigate the distribution of heavy metals (Cu, Cd, Zn, Ni and Pb) and Ecological Risk Assessment to assess the contamination levels of the coastal surface sediments. Distribution and ecological risk for Cu, Cd, Zn, Ni and Pb in sediment samples collected from 11 regions (37 stations) in the coasts of Yemen were studied. The results showed that the most of sediments are sand (83.83%), the content of organic matter was low (1.4%) and rich of calcium carbonate (56.1%), while the heavy metals arranged according to their abundance as follows: Zn>Cu>Ni>Pb>Cd. The contamination factor values for heavy metals arranged according to their dangerous as follows: Cd>Cu>Zn>Pb>Ni, and the potential ecological risk index values for heavy metals, according to the order evaluation of pollution in the various regions as follows: Qataba>Al-Mokha>North Al-Mokha>Al-Ruays>Abu-Zahr>South Al-Mokha>Zahari>Al-Khowkhah>Al-Haymah>Yokhtul>Moushij. The present study shows that the coastal sediments in this part of the Red Sea coast of Yemen are not Polluted by heavy metals (Cu, Zn, Ni and Pb), but it heavily polluted by Cd. Ecological risk assessment of heavy metals in coastal sediments between Al-Haymah and Al-Mokha, south red sea, Yemen 160 Copyright: ©2019 Al-Edresy et al. Citation: Al-Edresy MAM, Wasel SO, Al-Hagibi HA. Ecological risk assessment of heavy metals in coastal sediments between Al-Haymah and Al-Mokha, south red sea, Yemen. Int J Hydro. 2019;3(2):159-173. Ecological risk assessment of heavy metals in coastal sediments between Al-Haymah and Al-Mokha, south red sea, Yemen 161 Copyright: ©2019 Al-Edresy et al. Citation: Al-Edresy MAM, Wasel SO, Al-Hagibi HA. Ecological risk assessment of heavy metals in coastal sediments between Al-Haymah and Al-Mokha, south red sea, Yemen. Int J Hydro. 2019;3(2):159-173. Ecological risk assessment of heavy metals in coastal sediments between Al-Haymah and Al-Mokha, south red sea, Yemen 162 Copyright: ©2019 Al-Edresy et al. Citation: Al-Edresy MAM, Wasel SO, Al-Hagibi HA. Ecological risk assessment of heavy metals in coastal sediments between Al-Haymah and Al-Mokha, south red sea, Yemen. Int J Hydro. 2019;3(2):159-173. Citation: Al-Edresy MAM, Wasel SO, Al-Hagibi HA. Ecological risk assessment of heavy metals in coastal sediments between Al-Haymah and Al-Mokha, south red sea, Yemen. Int J Hydro. 2019;3(2):159-173. Ecological risk assessment of heavy metals in coastal sediments between Al-Haymah and Al-Mokha, south red sea, Y...

the highest concentrations of toxic heavy metals in marine environment are found in sediments [1,6,7].Coastal sediments are important hosts for heavy metal pollution and play an important role in determining the fate and effects of a wide variety of contaminants [8]. Vertical concentration gradients of heavy metals in sediment cores can provide temporal information about the perturbation in the aquatic environment [9]. The distribution of metals in sediment is very important from the point of view of environmental pollution because sediment concentrates metals from aquatic systems and represents an appropriate medium to monitor contamination due to sediments are the principal sinks for heavy metals in an aquatic system [1,7,10].