Contribution of GIS to Hydromorphometric Characterization of the Nkoup Watershed (Nun Plain-Cameroon)

Source:
By:Paul Bertrand Tsopkeng, Josiane Feugue Kenfack, David Guimolaire Nkouathio, Charles Antoine Basseka, Leonel Koudjou Tsague

DOI: https://doi.org/10.30564/agger.v5i3.5534

Abstract:

The Nkoup watershed (10°35’-10°47’E and 5°27’-5°42’N) is a volcanic zone situated in Nun Plain West Cameroon. The high fertility of the soils makes it a strategic agropastoral area where water resources are heavily exploited and used for several purposes. Due to human activities, soils and water resources are deteriorating, giving birth to water pollution and hydromorphological hazards. This work aims to determine the hydromorphometric parameters of the Nkoup watershed so that the data obtained help in the sustainable management of water resources and conservation of soil. To achieve this aim, various data were collected from DEM dataset derived from SRTM and processed in specialized software (QGIS and ArGIS). The simplified hydrological balance was calculated using the upstream approach. The Nkoup watershed has: Axial length Lax = 25.8 km, Axial Width Wax = 11.1 km, Perimeter P = 132.6 km, Area A = 173.7 km2 , Average Altitude Ha = 1726.3 m, Compactness Index Icomp = 2.8, Relief ratio Rr = 3.9 m/km, Circularity ratio Rc = 0.1, Elongation ratio R = 0.1, Drainage texture ratio Rt = 0.6, Drainage density Dd = 0.5 km/km2 . Stream Frequency Fs = 0.4, Channel Sinuosity Index CSI = 0.8, Stream gradient Sg = 0.6 and global slope Index Ig = 6.8 m/km. The specific height Difference Ds = 89.4 m shows moderate relief. The precipitation and evapotranspiration are unevenly distributed. With P = 187.7 mm/an, ETP = 953.4 mm/an, Q = 4.2 m3 /s, R = 762.5 mm/an, ETR = 832.3 mm/an and I = 282.9 mm/an. The Nkoup, 36.9 km long, has a sinuous aspect due to the low slope and the high CSI. The piezometric levels vary according to the seasons and the groundwater flow follows the N-S direction as surface flow.

References:

[1] TITA M. A., 2008. Warter pollution of the Nkoup river system and its environmental impacton Foumbot town (Western Cameroun) Thèse de Doctorat ph/D Univ de Yaoundé I. 212p. [2] Prabhakar, A.K., Singh, K.K., Lohani, A.K., et al., 2019. Study of Champua watershed for management of resources by using morphometric analysis and satellite imagery. Applied Water Science. 9, 1-16. DOI: https://link.springer.com/article/10.1007/s13201-019-1003-z [3] Chopra, R., Dhiman, R.D., Sharma, P.K., 2005. Morphometric analysis of sub-watersheds in Gurdaspur district, Punjab using remote sensing and GIS techniques. Journal of the Indian Society of Remote Sensing. 33, 531-539. [4] Gopinath, G., Nair, A.G., Ambili, G.K., et al., 2016. Watershed prioritization based on morpho metric analysis coupled with multi criteria decision making. Arabian Journal of Geosciences. 9, 1-17. [5] Bezinska, G.V., Stoyanov, K.S., 2019. Modelling and hydro-morphometric analysis of sub-watershed. A case study of Mesta river southwestern Bulgaria. European Journal of Geography. 10(2), 77-88. [6] Hamdan, A.M., 2020. Hydro-morphometric analysis using geospatial technology: A case study of Wadi Gabgaba and Wadi Allaqi watersheds, southern Egypt-northern Sudan. Journal of Asian Scientific Research. 10(3), 190-212. DOI: https://doi.org/10.18488/journal.2.2020.103.190.212 [7] Garde, R.J., 2006. River morphology. New Age International (Pvt) Ltd.: New Delhi. [8] Iqbal, M., Sajjad, H., Bhat, F.A., 2013. Morpho metric analysis of Shaliganga sub catchment, Kashmir Valley, India using geographical information system. International Journal of Engineering Trends and Technology. 4(1), 10-21. [9] Singh, P., Thakur, J.K., Singh, U.C., 2013. Morphometric analysis of Morar River Basin, Madhya Pradesh, India, using remote sensing and GIS techniques. Environmental Earth Sciences. 68(7), 1967-1977. [10]Bloomfield, J.P., Bricker, S.H., Newell, A.J., 2011. Some relationships between lithology, basin form and hydrology: A case study from the Thames basin, UK. Hydrological Processes. 25(16), 2518-2530. [11] Soni, S., 2016. Assessment of morphometric characteristics of Chakrar watershed in Madhya Pradesh India using geospatial technique. Applied Water Science. 7, 2089-2102. [12]Chandrashekar, H., Lokesh, K.V., Sameena, M., et al., 2015. GIS—based morphometric analysis of two reservoir catchments of Arkavati River, Ramanagaram District, Karnataka. Aquatic Procedia. 4, 1345-1353. [13]Horton, R.E., 1945. Erosional development of streams and their drainage basins; hydrophysical approach to quantitative morphology. Geological Society of America Bulletin. 56(3), 275-370. [14]Evans, I.S., 1972. General geomorphometry, derivatives of altitude, and descriptive statistics. Spatial analysis in geomorphology. Harper and Row: New York. pp. 17-90. [15]Altaf, F., Meraj, G., Romshoo, S.A., 2013. Morphometric analysis to infer hydrological be haviour of Lidder watershed, Western Himalaya, India. Geography Journal. 178021. [16]Wandji, P., Wotchoko, P., Bardintzeff, J.M., et al., 2010. Late tertiary and quaternary alkaline volcanism in the western Noun Plain (Cameroon Volcanic Line): New K-Ar ages, petrology and isotope data. Bulgarian Academy of Sciences. 48, 67-94. [17]Jenson, S.K., 1991. Applications of hydrologic information automatically extracted from digital elevation models. Hydrological Processes. 5(1), 31-44. [18]Wise, S., 2000. Assessing the quality for hydrological applications of digital elevation models derived from contours. Hydrological Processes. 14(11-12), 1909-1929. [19]Patel, A., Katiyar, S.K., Prasad, V., 2016. Performances evaluation of different open source DEM using Differential Global Positioning System (DGPS). The Egyptian Journal of Remote Sensing and Space Science. 19(1), 7-16. [20]Bastawesy, M.E., Gabr, S., White, K., 2013. Hydrology and geomorphology of the Upper White Nile Lakes and their relevance for water resources management in the Nile basin. Hydro logical Processes. 27(2), 196-205. [21]Li, J., Wong, D.W., 2010. Effects of DEM sources on hydrologic applications. Computers, Environment and Urban Systems. 34(3), 251-261. [22]Moore, I.D., Grayson, R.B., Ladson, A.R., 1991. Digital terrain modelling: A review of hydrological, geomorphological, and biological applications. Hydrological Processes. 5(1), 3-30. [23]Thornthwaite, C.W., 1954. The measurement of potential evapotranspiration. JM Mather, Seabrook: New Jersey. pp. 222. [24]Olivry, J.C., 1986. Fleuves et rivières du Cameroun (French) [Rivers and rivers of Cameroon]. Collection “Hydrological monographs. ORSTOM” N°9. Paris. P.781. (LVC) [PhD thesis]. Yaoundé: Université de Yaoundé I. p. 57. [25]Gaussen, H., Bagnouls, S., 1957. Les Climats biologiques et leur signification (French) [Biological climates and their significance]. Ann. Geol. XXVI. 193220 Ekodeck G.E (1984). 6(355), 194. [26]De Martonne, E., 1926. Une nouvelle fonction climatique: l’Indice d’Aridité (French) [A new climatic function: The Aridity Index]. Lamétéorologie. 449-458. [27]Schumm, S.A., 1956. Evolution of drainage systems and slopes in badlands at Perth Amboy, New Jersey. Geological Society of America Bulletin. 67(5), 597-646. [28]Rekha, B.V., George, A.V., Rita, M., 2011. Morphometric analysis and micro-watershed prioritization of Peruvanthanam sub-watershed, the Manimala River Basin, Kerala, South India. Environmental Research, Engineering and Management. 57(3), 6-14. [29]Leopold, L.B., Wolman, M.G., Miller, J.P., 1964. Fluvial processes in geomorphology. WH Freeman and Co.: San Francisco. [30]Gravelius, H., 1914. Grundrifi der gesamten gewcisserkunde (German) [Basic plan of the entire Gewisserkunde]. Band I: Flufikunde (Compendium of Hydrology. vol. I., Rivers in German). Goschen: Berlin. [31]Hack, J.T., 1957. Studies of longitudinal stream profiles in Virginia and Maryland. US Government Printing Office: Washington, DC. [32]Dubreuil, P., 1974. Introduction à l’analyse hydrologique (French) [Introduction to hydrological analysis]. Masson-ORSTOM: Paris. pp. 216. [33]Miller, V.C., 1953. Quantitative geomorphic study of drainage basin characteristics in the Clinch Mountain area, Virginia and Tennessee. Technical Report. Department of Geology Columbia University: New York. pp. 389-402. [34]Strahler, A.N., 1964. Quantitative geomorphology of drainage basin and channel networks. Handbook of applied hydrology. McGraw Hill: New York. pp. 439-476. [35]Choudhari, P.P., Nigam, G.K., Singh, S.K., et al., 2018. Morphometric based prioritization of watershed for groundwater potential of Mulariver basin, Maharashtra, India. Geology, Ecology, and Landscapes. 2(4), 256-267. [36]Dinpashoh, Y., Singh, V.P., Biazar, S.M., et al., 2019. Impact of climate change on streamflow timing (case study: Guilan Province). Theoretical and Applied Climatology. 138, 65-76.