Effects of sampling strategies and estimation algorithms on total nitrogen load determination in a small agricultural headwater watershed

Li, Ying; Yen, Haw; Harmel, R. Daren; Lei, Qiuliang; Jiaogen, Zhou; Hu, Wanli; Li, Wenchao; Lian, Huishu; Zhu, A‐Xing; Zhai, Limei; Wang, Hongyuan; Qiu, Weiwen; Luo, Jiafa; Wu, Siqi; Liu, Hongbin; Li, Xiaohong

doi:10.1016/j.jhydrol.2019.124114

Cited by 18 publications

(2 citation statements)

References 84 publications

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“…Thus, the sampling frequency is once a month or even less, while the daily water flow can be easily obtained. Therefore, in the flux calculation, it is necessary to use some methods to match the stream flow and water quality data of different scales [75], whereas the simulated value cannot be equal to the real value [76].…”

Section: Data Are Still a Problemmentioning

confidence: 99%

Review of Nonpoint Source Pollution Models: Current Status and Future Direction

Wang,

Chen,

et al. 2022

Water

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Modelling tools are commonly used for predicting non-point source (NPS) pollutants and it is timely to review progress that has been made in terms of the development of NPS models. This paper: (1) proposes a systematic description of model framework and generalizes some commonly used models; (2) identifies the common challenges in model structure and applications; (3) summarizes the future directions of NPS models. Challenges in model construction and application are based on the following: (1) limitations in understanding specific NPS pollution processes; (2) model expansion to different scales; (3) data scarcity and its impacts on model performance; (4) prediction uncertainty due to model input, parameter and model structure; (5) insufficient accuracy for decision-making. Finally, this paper proposes future directions for model development, including: (1) a source–flow–sink framework for model development; (2) standardization for model input and parameter; (3) reliable decision support for environmental management. The findings of this review provide helps in the accurate prediction and management of NPS pollution around the world.

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Section: Data Are Still a Problemmentioning

confidence: 99%

Review of Nonpoint Source Pollution Models: Current Status and Future Direction

Wang,

Chen,

et al. 2022

Water

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“…To prevent qualitative depletion of water resources, any environmental policy should focus on the priority of clean water as the basis for the maintenance of public health and key life-sustaining conditions (stable functioning of water and land ecosystems, efficiency and quality of agricultural products, reproduction of fish resources, recreational and aesthetic potential of water bodies) [24][25][26]. Along with hydrological and hydroecological monitoring of water bodies in specific places and at the outlet, it is no less essential to monitor natural and economic situations, particularly agroenvironmental parameters within river basins [27][28][29][30][31][32][33][34]. Therefore, a set of water quality indicators with a unique range of values should be produced for different river basins with due account for specifics of economic management and physiographical, geological, topographical, and climatic conditions [35].…”

Section: Introductionmentioning

confidence: 99%

Basin-Scale Approach to Integration of Agro- and Hydroecological Monitoring for Sustainable Environmental Management: A Case Study of Belgorod Oblast, European Russia

et al. 2022

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The quantitative and qualitative depletion of water resources (both surface and groundwater) is closely related to the need to protect soils against degradation, rationalization of land use, and regulation of surface water runoff within the watershed area. Belgorod Oblast (27,100 km2), one of the administrative regions of European Russia, was chosen as the study area. It is characterized by a high activity of soil erosion (the share of eroded soils is about 48% of the total area of arable land). The development phase of the River Basin Environmental Management Projects (217 river basins from the fourth to seventh order) allowed for the proceeding of the development of an integrated monitoring system for river systems and river basin systems. The methods used to establish a geoecological network for regional monitoring include the selection and application of GIS techniques to quantify the main indicators of ecological state and predisposition of river basins to soil erosion (the share of cropland and forestland, the share of the south-oriented slopes, soil erodibility, Slope Length and Steepness (LS) factor, erosion index of precipitation, and the river network density) and the method of a hierarchical classification of cluster analysis for the grouping of river basins. An approach considering the typology of river basins is also used to expand the regional network of hydrological gauging stations to rationalize the national hydrological monitoring network. By establishing 16 additional gauging stations on rivers from the fourth to seventh order, this approach allows for an increase in the area of hydro-agroecological monitoring by 1.26 times (i.e., up to 77.5% of the total area of Belgorod Oblast). Some integrated indicators of agroecological (on the watershed surface) and hydroecological (in river water flow) monitoring are proposed to improve basin environmental management projects. Six-year monitoring showed the effectiveness of water quality control measures on an example of a decrease in the concentrations of five major pollutants in river waters.

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A flow-weighted approach to generate daily total phosphorus loads in streams based on seasonal loads

Ouyang

2021

Environ Monit Assess

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Effects of sampling strategies and estimation algorithms on total nitrogen load determination in a small agricultural headwater watershed

Cited by 18 publications

References 84 publications

Review of Nonpoint Source Pollution Models: Current Status and Future Direction

Review of Nonpoint Source Pollution Models: Current Status and Future Direction

Basin-Scale Approach to Integration of Agro- and Hydroecological Monitoring for Sustainable Environmental Management: A Case Study of Belgorod Oblast, European Russia

A flow-weighted approach to generate daily total phosphorus loads in streams based on seasonal loads

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