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HYDROGEOPHYSICAL SURVEY OF THE FRESHWATER-SALINEWATER INTERFACE IN OPOBO/NKORO LOCAL GOVERNMENT AREA, RIVERS STATE, SOUTH EASTERN NIGER DELTA



HYDROGEOPHYSICAL SURVEY OF THE FRESHWATER-SALINEWATER INTERFACE IN OPOBO/NKORO LOCAL GOVERNMENT AREA, RIVERS STATE,
SOUTH EASTERN NIGER DELTA

Womuru Edwin Nnamdi and Ibim, Dagogo Franklin
Department of Physics,
Ignatius Ajuru University of Education, Port Harcourt, Rivers State, Nigeria
Email: edwinwomuru@gmail.com

ABSTRACT
Nine Schlumberger Vertical electrical  sounding (VES) were carried  out  in  Opobo/Nkoro Local government  Area  in Rivers State  of  Nigeria .The  vertical electrical  sounding  data were  modeled  using  resist software  into five geo electric  layers. The  first  layer is the  top soil  while  that  of the  other  layers  varied  between  sand, coarse sand, clayey sand, clay  and  gravelly 
sand. The interpreted  resistivity  shows  that  the  resistivity is very  low  in VES I (Oprokuno Nkoro),VES 2 (Nkoro II), VES 3 (Queens Town), VES 4(Kalaibiama), VES 5(Minima), VES 6 (Opusunju, VES 7(Oprokuno Town I), VES 8 (Opobo Town 2) and  VES 9(Opobo Town 3).The areas with  extreme low  resistivity values  are  VES 3, VES 5, VES6, VES7,VES8 and VES 9. The  depth  of  freshwater  and  salinewater  interface  ranges  from  19.7m  to  60.2m. The  highest   value  occur  in Nkoro (VES2).
Key Words: Hydrogeophysical, vertical electrical sounding, groundwater, saline water intrusion.

INTRODUCTION
Overtime  there  has  been  dependence  on  subsurface  water  resources  to augment   domestic  needs  of  freshwater  supplies gotten  from the  surface  which  further  serves  as  a rallying  point  for  industrial  and  agricultural requirements. Most  times  groundwater resources  are  preferable  to  surface water resources  due to  the  fact  that it is  not  easily prone  to  surface  pollution and  it is  always  available regardless of  seasons (Nkotagu & Nkwizu, 2004 Oyedele & Momoh, 2009). Oyedele &  Momoh confirmed  that  it has  also  been found  that  groundwater  supplies  are  more  economic in purification aspect  than  alternative water  supplies, specifically  surface water  resources  (Oyedele & Momoh, 2009).


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