Present-day sediment dynamics of the Sanaga catchment (Cameroon): from the total suspended sediment (TSS) to erosion balance

被引：14

作者：

Ngoupayou, J. R. Ndam ^{[1
]}

Dzana, J. G. ^{[2
]}

Kpoumie, A. ^{[1
,3
]}

Ghogomu, R. Tanwi ^{[1
]}

Takounjou, A. Fouepe ^{[4
]}

Braun, J. J. ^{[5
]}

Ekodeck, G. E. ^{[1
]}

机构：

[1] Univ Yaounde I, Dept Earth Sci, Yaounde, Cameroon

[2] Univ Yaounde I, Dept Geog, Yaounde, Cameroon

[3] Univ Maroua, Dept Earth Sci, Maroua, Cameroon

[4] Hydrol Res Ctr, Inst Geol & Min Res, Yaounde, Cameroon

[5] IISc, IISc IRD Joint Int Lab, Indofrench Cell Water Sci, Bangalore, Karnataka, India

来源：

HYDROLOGICAL SCIENCES JOURNAL-JOURNAL DES SCIENCES HYDROLOGIQUES | 2016年 / 61卷 / 06期

关键词：

Sanaga catchment; total suspended sediment; mechanical denudation; hydroclimatic variability; river impoundments; dam siltation; CARBON-ISOTOPE COMPOSITION; CHEMICAL-WEATHERING RATES; ORGANIC-CARBON; MECHANICAL EROSION; NORTHERN ETHIOPIA; CENTRAL-AFRICA; RIVER SYSTEM; CONGO RIVER; TRANSPORT; BASIN;

D O I：

10.1080/02626667.2014.968572

中图分类号：

TV21 [水资源调查与水利规划];

学科分类号：

081501 ;

摘要：

Total suspended sediment (TSS) data for 1960-1970 and from recent investigations (1990-2000) are used to evaluate the variability in sediment yield of the Sanaga catchment (Cameroon) and the equivalent rates of erosion. At the annual and seasonal time scales, total suspended sediment concentrations for the Mbam sub-catchment are three to four times higher than for the Sanaga basin, reflecting the higher sensitivity of the former to erosion. Classical clockwise hysteresis loops are observed in both sub-catchments, despite a significant increase in human-induced catchment changes. At the multi-year time frame (over a 40-year period), it appears that the second half of the 1990s is marked by a downward trend in TSS. This shift is due to the control infrastructures (river impoundments and ponds) installed in certain parts of the whole catchment, combined with a drop in annual rainfall and river discharge.

引用

页码：1080 / 1093

页数：14

共 8 条

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