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

作　　者：Paul Bertrand Tsopkeng Josiane Feugue Kenfack David Guimolaire Nkouathio Charles Antoine Basseka Leonel Koudjou Tsague 

机构地区：[1]Postgraduate School for Pure and Applied Sciences,The University of Douala,P.O.Box 2701,Douala,Cameroon [2]Department of Geography,Faculty of Letters and Human Sciences,P.O.Box 49,The University of Dschang,Cameroon [3]Department of Earth Sciences,Faculty of Sciences,P.O.Box 67,The University of Dschang,Dschang,Cameroon [4]Department of Hydraulics and Water Management,National Advanced School of Engineering of Maroua,The Uni­versity of Maroua,P.O.Box 46,Maroua,Cameroon

出　　处：《Advances in Geological and Geotechnical Engineering Research》2023年第3期1-15,共15页地质与岩土工程研究进展（英文）

摘　　要：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 L_(ax)=25.8 km,Axial Width W_(ax)=11.1 km,Perimeter P=132.6 km,Area A=173.7 km^(2),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/km^(2).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.

关 键 词：Nkoup watershed Water resources Hydromorphometric parameters Hydrological balance Groundwater flows direction 

分 类 号：S15[农业科学—土壤学]