Cameroon

Cameroon

Check the article published in Hydrological Processes summarizing the M-TROPICS activity in Cameroon here

The monitored sites constitute a network of nested sub-basins within the Nyong River Basin (18,500 km2) in a tropical humid forest mildly impacted by anthropogenic activities on the South Cameroon Plateau. The monitoring network consists of the Nsimi SEW (Mengong stream; 0.60 km2), and the sampling/gauging stations of Messam on the Awout River (206 km2), Pont So’o on the So’o River (3000 km2), and Mbalmayo (13,500 km2) and Olama (18,500 km2), both on the Nyong River

Monitoring setup of the Nyong River Basin

Map of the Nyong River Basin showing the monitored stations
StationRiverLongitudeLatitudeElevation (m)Area (km²)Length (km)Slope (‰)Order
NsimiMengong11° 50′ E3° 10′ N6690.600.7513.31
MessamAwout11° 47′ E3° 17′ N647206301.23
Pont So’oSo’o11° 29′ E3° 19′ N6343 0701071.14
MbalmayoNyong11° 30′ E3° 31′ N63413 5553600.165
OlamaNyong11° 17′ E3° 26′ N62818 5104190.155
Characteristics of the monitored stations and watersheds of the Nyong River Basin

Monitoring setup of the Nsimi SEW

Monitoring setup of the Nsimi SEW

Variables and sampling/acquisition frequencies

VariableMethodTime frameFrequency
Weather variables (Nsimi SEW only)
Rainfall (RFm)manual and weather station1991 and since 1994daily and hourly
Temperatures (Tmin, Tmax, Tmean), relative humidity (Hummean), wind direction and speed (Dirwind, Vwind), global radiation (GRinstant, Grcumul), daily evapostranspiration (PETday)weather station2004-2008 and since 2018hourly
Hydrological variables (all sites)
Water discharge (Q) calculated from water levelwater level acquired with automatic limnimeter and manual (limnimetric scale)since 1991 (Nsimi SEW outlet), 1995-1999 (Nsimi SEW spring), since 1998 (large river sites)10 min (automatic), daily (manual)
Hydrochemical variables (all sites)
Major elements (anions, cations, silica), dissolved organic carbon (DOC)Ion chromatography at LAGE (Cameroon), TOC analyzer, spectrophotometer, ICP-OES at GET (France)since 1994 (Nsimi SEW), since 1998 (large river sites), from 2002 to 2007 (piezometers in Nsimi SEW)fortnightly
pH, electric conductivity, water temperature, alkalinity, suspended particulate matter (SPM)pH- and conductivity meter, thermometer, titrimeter, filtration unitsince 1994 (Nsimi SEW), since 1998 (large river sites)fortnightly
Variables and sampling/acquisition frequencies monitored in the Nyong River Basin

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