Application of SWAT in Non-Point Source Pollution of Upper Xiliaohe Basin, China

Hao, Lu; Shen, Shuanghe; Gao, Jingmin; Wang, Jing’ai

doi:10.1109/icbbe.2010.5516946

Cited by 1 publication

(1 citation statement)

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“…The standard for nutrient assessment is not as high. The absolute value of relative error should be less than 40%, the absolute value of the Nash coefficient (Ens) should be greater than 0.5 [31], and the standard for R 2 is the same as that for runoff [32]. We can tell that the simulations for both nitrogen and phosphorus are able to comply with the standard of accuracy, indicating that the modified model is effective for further research in NPS simulation and analysis.…”

Section: Results Of Simulations With the Modified Modelmentioning

confidence: 99%

Evaluation of Distribution Properties of Non-Point Source Pollution in a Subtropical Monsoon Watershed by a Hydrological Model with a Modified Runoff Module

Zhang

Huang

Chen

et al. 2019

Water

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Non-point source pollution (NPS) is difficult to manage for watersheds, due to the scattering of pollution sources and uncertainty over the time it takes to accumulate. Since local agriculture and poultry rearing prevail, NPS occupies a large proportion of local pollution. In this paper, we modified the runoff module of the Soil and Water Assessment Tool (SWAT) to study the distribution properties and the effect of control of NPS in the Binjiang watershed in Southern China. The model was run from 2005 to 2014. The runoff simulation’s accuracy had apparently improved compared to the original model, as the Nash coefficient (Ens) had improved from 0.72 to 0.89, and the determination coefficient (R2) had improved from 0.75 to 0.91, an improvement in accuracy of 23.61% (Ens) and 21.33% (R2). Thus, the modified model (SWAT-m) is more adaptable for the simulation of extensive non-urban watersheds in subtropical monsoon climates. The validated model was used in further analysis. The results show that 82–90% of total nitrogen and 83–89% of total phosphorus were concentrated in the period from April to September annually. Through the introduction of the pollution generation potential parameter Φi, we obtained the descending order of all sub-basins in terms of their pollution generation potential. The critical source areas (CSAs) were found to be the northeast sub-basins in lower terrain that is used mainly for agricultural applications, accounting for 53% of the total watershed. The accumulation time is April to July, occupying 69% of annual generation. The simulation of management measures showed that NPS control has a good effect, with a 15 m filter strip in CSAs. Ammonia nitrogen and total phosphorus can be reduced apparently by 32% and 43%, respectively. The results may provide support for the management of NPS in watersheds under similar conditions.

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Section: Results Of Simulations With the Modified Modelmentioning

confidence: 99%