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| Content Provider | Springer Nature Link |
|---|---|
| Author | Nwankwor, G. Anyaogu, C. |
| Copyright Year | 2000 |
| Abstract | The hydrologic and water-quality characteristics of a small tropical riverine wetland at Ulakwo, near Owerri, Imo State, Nigeria, were evaluated by analysis of stream hydrographs, the groundwater flow system, and geochemical analyses. This research is an initial step toward providing information needed to develop a programme of sustainable development of the ecosystem. The wetland is underlain by a layer of organic debris and hydromorphic soils, which in turn are underlain by an unconfined alluvial sand aquifer about 80 m thick. Horizontal and upward vertical hydraulic head gradients of about 0.002 and 0.001, respectively, and the results of a flow-net analysis suggest that considerable amounts of groundwater flow into the wetland.Low concentrations of Fe, NO$_{3}$, PO$_{4}$, and SO$_{4}$ in the wetland water column are probably due to short-term removal of these nutrients from the surface-water by adsorption on the surficial wetland organic matter and bottom sediments. The groundwater flow system is important in the maintenance of the wetland, which probably plays an important role in the flow stabilisation and improvement of the water quality of the river. Les caractéristiques hydrologiques et de qualité de l’eau d’une petite zone humide tropicale riparienne à Ulakwo, près d’Owerri (État d’Imo, Nigeria) ont été déterminées à partir de l’analyse des hydrogrammes de la rivière, de l’étude de la nappe et d’analyses géochimiques. Cette recherche est une étape initiale pour obtenir les informations nécessaires à la mise en place d’un programme de développement durable de l’écosystème. La zone humide se développe sur un niveau de débris organiques et de sols hydromorphes, qui recouvrent eux-mêmes un sable alluvial constituant un aquifère libre épais d’environ 80 m. Le gradient de charge hydraulique horizontal et celui vertical ascendant, respectivement de 2 et 1 pour mille environ, et les résultats de l’analyse de l’écoulement net laissent penser que des volumes considérables d’eau souterraine s’écoulent vers la zone humide.Les faibles concentrations en Fe, NO$_{3}$, PO$_{4}$, et SO$_{4}$ dans la colonne d’eau de la zone humide sont probablement dues à la mobilisation à court terme de ces nutriments de l’eau de surface par adsorption sur la matière organique superficielle et sur les sédiments du fond de la zone humide. La nappe est essentielle pour le maintien de la zone humide qui joue probablement un rôle important dans la stabilisation de l’écoulement et la conservation de la qualité de l’eau de la rivière. Se han evaluado las características hidrológicas y la calidad de las aguas de un pequeño humedal tropical ribereño en Ulakwo, cerca de Owerri (Estado de Imo, Nigeria), mediante el análisis de hidrogramas, del sistema de flujo de las aguas subterráneas y de la hidrogeoquímica. Esta investigación supone un primer paso en la obtención de la información necesaria para establecer un programa de desarrollo sostenible del ecosistema. El humedal yace sobre una capa de materia orgánica y suelos hidromorfos, que, a su vez, se superpone a un acuífero libre de arenas aluviales de unos 80 m de espesor. Los gradientes del nivel piezométrico en la vertical y en la horizontal valen 0,002 y 0,001, respectivamente, y los resultados del análisis de la red de flujo sugieren que la contribución de las aguas subterráneas al humedal es considerable.Las bajas concentracions de nutrientes como hierro, nitrato, fosfato y sulfato en la columna de agua del humedal probablemente se pueden atribuir a su rápida adsorción en la capa superficial de materia orgánica y en los sedimentos del fondo. El sistema de flujo subterráneo es importante para el mantenimiento del humedal, el cual probablemente desempeña un papel notable en la estabilización del flujo del río y en la mejora de la calidad de sus aguas. |
| Starting Page | 646 |
| Ending Page | 653 |
| Page Count | 8 |
| File Format | |
| ISSN | 14312174 |
| Journal | Hydrogeology Journal |
| Volume Number | 8 |
| Issue Number | 6 |
| e-ISSN | 14350157 |
| Language | English |
| Publisher | Springer-Verlag |
| Publisher Date | 2000-10-27 |
| Publisher Institution | International Association of Hydrogeologists |
| Publisher Place | Berlin, Heidelberg |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Hydrogeology Hydrology/Water Resources Geology Waste Water Technology Water Pollution Control Water Management Aquatic Pollution |
| Content Type | Text |
| Resource Type | Article |
| Subject | Earth and Planetary Sciences Water Science and Technology |
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