Geomorphometric attributes of the global system of rivers at 30-minute spatial resolution

Vörösmarty, Charles J; Fekete, B M; Meybeck, Michel; Lammers, R. B.

doi:10.1016/s0022-1694(00)00282-1

Cited by 189 publications

(154 citation statements)

References 33 publications

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“…Manual correction is the largest obstacle in deriving macro-scale river network maps, and thus the number of feasible river network maps with adequate manual correction for use in global river routings is limited (e.g., Oki and Sud, 1999;Vörösmarty et al, 2000;Döll and Lenner, 2000). As it does not require manual correction, the FLOW method can provide river network maps at various resolutions.…”

Section: Discussionmentioning

confidence: 99%

Deriving a global river network map and its sub-grid topographic characteristics from a fine-resolution flow direction map

Yamazaki

Oki

Kanae

2009

Hydrol. Earth Syst. Sci.

129

132

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Abstract. This paper proposes an improved method for converting a fine-resolution flow direction map into a coarseresolution river network map for use in global river routing models. The proposed method attempts to preserve the river network structure of an original fine-resolution map in the upscaling procedure, as this has not been achieved with previous upscaling methods. We describe an improved method in which a downstream cell can be flexibly located on any cell in the river network map. The improved method preserves the river network structure of the original flow direction map and allows automated construction of river network maps at any resolution. Automated construction of a river network map is helpful for attaching sub-grid topographic information, such as realistic river meanderings and drainage boundaries, onto the upscaled river network map. The advantages of the proposed method are expected to enhance the ability of global river routing models by providing ways to more precisely represent surface water storage and movement.

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Section: Discussionmentioning

confidence: 99%

Deriving a global river network map and its sub-grid topographic characteristics from a fine-resolution flow direction map

Yamazaki

Oki

Kanae

2009

Hydrol. Earth Syst. Sci.

129

132

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“…We used Global NEWS-2, which is thus a unified modeling environment to facilitate the analyses of nutrient exports by rivers of different scenarios and comparisons by basin and by element or form. Basins are described using a Simulated Topological Network (STN-30p, version 6.01) (Vörösmarty et al 2000a(Vörösmarty et al , 2000b. Global NEWS-2 includes a submodel for dissolved nutrient forms and a submodel for particulate substances.…”

Section: Global News Modelsmentioning

confidence: 99%

Past and future trends in nutrient export by 19 rivers to the coastal waters of Indonesia

Suwarno¹,

Löhr²,

Kroeze³

et al. 2013

Journal of Integrative Environmental Sciences

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This article analyzes past and future trends in nutrient export of dissolved and particulate nitrogen and phosphorus by rivers into the coastal waters of Indonesia. The focus is on 19 rivers included in the Global Nutrients Export from WaterSheds model. In the past, export of dissolved inorganic nitrogen by rivers doubled, while export of other forms of nitrogen and phosphorus by rivers did not change largely. For future trends of four Millennium Ecosystem Assessment scenarios, the largest increases are calculated for river export of dissolved inorganic phosphorus by rivers caused by increased inputs from sewage systems. The export of other nutrient forms is relatively constant in time, which is surprising, given the growing population and the associated increasing inputs of nitrogen and phosphorus to the land. Changes in export by rivers are the net effect of human activities and changes in hydrology. The results indicate that future increases in nitrogen and phosphorus inputs on land are partly counterbalanced by decreases in basin discharge as a result of climate change and consumptive water use. These results differ from other Asian regions, for which large increases in nitrogen and phosphorus inputs to coastal waters are calculated. This can be explained by population growth, gross domestic product increase, and sewage system development.

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“…In a first test, runoff output from JESSY is compared to river basin discharge data from the 35 largest catchments by area of the world. A basin mask from Vörösmarty et al (2000) is used to identify the model grid cells contributing to a certain basin. The discharge data is taken from Dai and Trenberth (2002).…”

Section: Observational Datasets To Test the Modelmentioning

confidence: 99%

Entropy production of soil hydrological processes and its maximisation

2011

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Abstract. Hydrological processes are irreversible and produce entropy. Hence, the framework of non-equilibrium thermodynamics is used here to describe them mathematically. This means flows of water are written as functions of gradients in the gravitational and chemical potential of water between two parts of the hydrological system. Such a framework facilitates a consistent thermodynamic representation of the hydrological processes in the model. Furthermore, it allows for the calculation of the entropy production associated with a flow of water, which is proportional to the product of gradient and flow. Thus, an entropy budget of the hydrological cycle at the land surface is quantified, illustrating the contribution of different processes to the overall entropy production. Moreover, the proposed Principle of Maximum Entropy Production (MEP) can be applied to the model. This means, unknown parameters can be determined by setting them to values which lead to a maximisation of the entropy production in the model. The model used in this study is parametrised according to MEP and evaluated by means of several observational datasets describing terrestrial fluxes of water and carbon. The model reproduces the data with good accuracy which is a promising result with regard to the application of MEP to hydrological processes at the land surface.

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Geomorphometric attributes of the global system of rivers at 30-minute spatial resolution

Cited by 189 publications

References 33 publications

Deriving a global river network map and its sub-grid topographic characteristics from a fine-resolution flow direction map

Deriving a global river network map and its sub-grid topographic characteristics from a fine-resolution flow direction map

Past and future trends in nutrient export by 19 rivers to the coastal waters of Indonesia

Entropy production of soil hydrological processes and its maximisation

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