Streamflow, sediment and carbon transport from a Himalayan watershed

Sharma, Pankaj; Rai, Sumit

doi:10.1016/j.jhydrol.2003.11.023

Cited by 28 publications

(15 citation statements)

References 22 publications

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“…Results of this study are much higher than most of small mountainous rivers in New Zealand as reported by Carey et al [2005]. However, the values in this study are smaller than the mountainous Sikkim River, Himalaya with POC and DOC yield values of 28 and 67 t km À1 a À1 , respectively [Sharma and Rai, 2004]. The total sediment yield from the Brantas River at about 272 t km À2 a À1 is similar to that of the Ganges River (530 t km À2 a À1 ), which ranks number 17 among the top 20 rivers that originate at elevations above 3000 m and above those of the Indus (260 t km À2 a À1 ), Yangtze (250 t km À2 a À1 ) and Amazon River (190 t km À2 a À1 ).…”

Section: Discussioncontrasting

confidence: 69%

Spatial and seasonal dynamics of riverine carbon fluxes of the Brantas catchment in East Java

Aldrian

Chen

Adi³

et al. 2008

J. Geophys. Res.

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[1] Dissolved and particulate organic and inorganic carbon concentrations and flux were measured from July 2005 to June 2006 in the Brantas River basin, a midsized tropical mountainous river and the second largest in Java. There were large seasonal differences in carbon fluxes. Dissolved inorganic carbon (DIC) fluxes were 9.3 times greater and dissolved organic carbon (DOC) fluxes were 532 times greater in the wet season (October to April) than in the dry season. These large contrasts in concentration lead to large differences in load between dry and wet months. In the wet season between January and April, DIC and DOC fluxes are 66% and 87%, respectively, of the total annual fluxes. Most of the annual fluxes of total suspended solids (2.7 Â 106 t a À1 ), total dissolved solids (2.3 Â 106 t a À1 ), DIC (0.26 Â 106 t a À1), and DOC (0.2 Â 106 t a À1 ) are transported into the Madura Strait. Accordingly, the Brantas River ranks number 17 among the top 20 rivers that originate at elevations above 3000 m. The concentration of DIC is consistently high all yearlong due to carbonate weathering in the river basin, except in the middle part of the basin, whereas the concentration of DOC is highly seasonal because of variations in biological activities. The total inorganic carbon concentration substantially exceeded the total organic carbon concentration, but the differences decreased from January to April when DOC increased sharply. The carbon budget indicates that the upstream river is a carbon source, and the middle sections of the river are a carbon sink. No carbon trapping was observed by the several impoundments over the basin while sediment trapping was obvious.

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Section: Discussioncontrasting

confidence: 69%

Spatial and seasonal dynamics of riverine carbon fluxes of the Brantas catchment in East Java

Aldrian

Chen

Adi³

et al. 2008

J. Geophys. Res.

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“…Despite the large number of studies reporting on TOC/DOC losses from forested catchments, published data on exports of organic C from agricultural land has remained limited. Recently, high organic C losses from some single agricultural catchments (Correl et al 2001;McTiernan et al 2001;Sharma and Rai 2004) have been reported. Our large scale boreal data was in agreement with these studies showing that agricultural land increased the TOC concentrations, although the proportion of agricultural land in the catchments was reasonably low, on average 12%.…”

Section: Impact Of Land Use Covermentioning

confidence: 99%

Export of DOM from Boreal Catchments: Impacts of Land Use Cover and Climate

2005

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Dissolved organic matter (DOM) is an important fraction in carbon (C) and nutrient budgets for aquatic ecosystems and can have broad effects on food webs and nutrient cycling. To look at the role land use cover and climate might play in DOM transport from the boreal region, the export of total organic carbon (TOC), total organic nitrogen (TON) and dissolved organic phosphorus (DOP) was estimated for Finnish main rivers and their sub-catchments, altogether 86 catchments, situated between latitudes 60°N and 69°N and covering 297,322 km 2 , 88% of the total area of Finland. On an average, 94% of the TOC, 90% of the total nitrogen (TN) and 40% of the total phosphorus (TP) in Finnish rivers was in a dissolved form. The majority of the DOM export from Finnish catchments consists of organic C. The TOC export increased with increasing peatland proportion (r = 0.39, p = 0.003), while TON export increased with the increasing percentage of agricultural land (r = 0.60, p < 0.001). Although upstream lakes covered only on average 9% of the catchment area, they were the most important predictor for TOC, TON and DOP export (r = À0.83, r = À0.82 and r = À0.61, respectively). The higher the upstream lake percentage, the lower the export indicating organic matter retention in lakes.

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“…Three rainfall events were considered for each monsoon period totaling 18 events during 2 years of study (1999)(2000) (Sharma and Rai, 2004). The suspended clay material was separated by filtration through Whatman filter paper size 42 from the water sample.…”

Section: Carbon Storage and Flux Analysismentioning

confidence: 99%