Combined inverse modeling approach and load duration curve method for variable nitrogen total maximum daily load development in an agricultural watershed

Chen, Dingjiang; Lü, Jun; Wang, Hailong; Shen, Yena; Gong, Dongqin

doi:10.1007/s11356-011-0502-8

Cited by 26 publications

(10 citation statements)

References 28 publications

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“…This indicates that generation of TN input loads was larger than the corresponding total maximum allowable load with increasing river discharge. Thus, a temporally variable expression (e.g., a function of river discharge) is required for determining input load reduction allocations (Chen et al, 2011b. The percentage of time that DS inputs dominate (> Q e 0 , Fig.…”

Section: Using the Modified Lam For Targeting Nitrogen Input Load Redmentioning

confidence: 99%

A modified load apportionment model for identifying point and diffuse source nutrient inputs to rivers from stream monitoring data

Chen

Dahlgren

Lü

2013

Journal of Hydrology

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s u m m a r yDetermining point (PS) and diffuse source (DS) nutrient inputs to rivers is essential for assessing and developing mitigation strategies to reduce excessive nutrient loads that induce eutrophication. However, application of watershed mechanistic models to assess nutrient inputs is limited by large data requirements and intensive model calibration efforts. Simple export coefficient models and statistical models also require extensive primary watershed attribute information and further they cannot address seasonal patterns of nutrient delivery. In practice, monitoring efforts to identify all PSs within a watershed are very difficult due to time and economic limitations. To overcome these issues, based on the fundamental hydrological differences between PS and DS pollution, a modified load apportionment model (LAM) was developed relating the river nutrient load to nutrient inputs from PS, DS and upstream inflow sources while adjusting for in-stream nutrient retention processes. Estimates of PS and DS inputs can be easily achieved through Bayesian calibration of the five model parameters from commonly available stream monitoring data. It considers in-stream nutrient retention processes, temporal changes of PS and DS inputs, and nutrient contributions from upstream inflow waters, as well as the uncertainty associated with load estimations. The efficacy of this modified LAM was demonstrated for total nitrogen (TN) source apportionment using a 6-year record of monthly water quality data for the ChangLe River in eastern China. Aimed at attaining the targeted river TN concentration (2 mg L À1 ), required input load reductions for PS, DS and upstream inflow were estimated. This modified LAM is applicable for both district-based and catchment-based water quality management strategies with limited data requirements, providing a simple, effective and economical tool for apportioning PS and DS nutrient inputs to rivers.

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Section: Using the Modified Lam For Targeting Nitrogen Input Load Redmentioning

confidence: 99%

A modified load apportionment model for identifying point and diffuse source nutrient inputs to rivers from stream monitoring data

Chen

Dahlgren

Lü

2013

Journal of Hydrology

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“…3, the cumulative probability of achieving 387.3 ton was approximately 51.22%, which indicates a 48.78% water quality risk probability if the management plans were designed based on this estimated load. This risk probability could be due to the information loss of the model structure that represents the P cycle with varying levels of detail (Chen et al, 2011;Grey and Gupta, 2015). In this sense, this cumulative probability can be used to support risk analyses before watershed plans are implemented, provided that the chosen model structures consider all relevant processes of the P cycle and simulate them accurately.…”

Section: The Stochastic Simulation Resultsmentioning

confidence: 99%

Structural uncertainty in watershed phosphorus modeling: Toward a stochastic framework

Chen

Gong

Shen

2016

Journal of Hydrology

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“…Spatial monitoring (nested catchment experiment) For the experimental catchments, monitoring quali-quantitative control sites of water yield is selected through Nested Catchment Experiment method (NCE) [41] We also suggest using flow-load duration curves in the monitoring of the Water Producer/PCJ project, to describe the pollution loads according to flow rates, facilitating to visualize the quali-quantitative natural behavior of freshwater resources [14] [35] [48]. Flow and load duration curves demonstrate changes in land use or climate in the watersheds [13].…”

Section: Types Of Monitoringmentioning

confidence: 99%

Hydrologic Monitoring Plan of the Brazilian Water Producer/PCJ Project

Taffarello¹,

Guimarães²,

Lombardi³

et al. 2016

JEP

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Both Ecosystem-based Adaptation (EbA) and Payment for Ecosystem Services (PES) have a wide range of strategies that include different economic instruments for nature conservation. Although the generation and maintenance of payment for hydrologic ecosystem services (Water-PES) is expanding in Brazil, there are difficulties in the implementation of projects. Due to the complexity and non-linearity of the hydrological processes, also affecting both EbA and Water-PES goals, monitoring qualiquantitative aspects of streams have been here addressed as a useful management tool. This study presents the Hydrological Monitoring Plan (HMP) of the Water Producer/PCJ project, operating between 2009-2014, in order to: 1) evaluate the impact of project actions under water quali-quantitative aspects; and 2) promote the incorporation of HMP's elements in water resources management. HMP of the Water Producer/PCJ project has been implemented following the conditions for efficiency (baseline, long-term scale compatible with the actions of the project, in the experimental and reference watersheds). In addition, HMP is being implemented from upstream to downstream in catchments with areas ranging from 17 to 130 km 2 . This proposal favors the quantification and valuation of hydrologic services that could be assessed by ecohydrologic monitoring and modeling. Thus, we look forward to the consolidation of the Brazilian information system of water resources, the reduction of modeling uncertainties and integrated assessment of the consequences of landuse/land-cover change that strongly impact goals of EbA and Water-PES initiatives.

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Combined inverse modeling approach and load duration curve method for variable nitrogen total maximum daily load development in an agricultural watershed

Abstract: For the NPS pollution-dominated watershed, temporal variable expressions of TMDL and requiring reduction are both necessary. This combined approach provides researchers and managers with a simple but efficient tool for variable TMDL development.

Cited by 26 publications

References 28 publications

A modified load apportionment model for identifying point and diffuse source nutrient inputs to rivers from stream monitoring data

A modified load apportionment model for identifying point and diffuse source nutrient inputs to rivers from stream monitoring data

Structural uncertainty in watershed phosphorus modeling: Toward a stochastic framework

Hydrologic Monitoring Plan of the Brazilian Water Producer/PCJ Project

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