An analysis of infection risk caused by the compound disaster of a large earthquake with flooding in an urban river catchment

Excessive nutrient input from urban areas increases the occurrence of eutrophication. Control of nutrient loads is perceived as the primary restoration method. Quantifying temporal variation of nutrient loads is essential to understand the dynamic relationships of nutrient source-impacts in the urban water system and investigate the operational efficiency of treatment facilities for eutrophication control. Here, a holistic approach was developed to estimate nutrient loads from different sources and evaluate nutrient impacts on the urban water environment. An integrated catchment model of nutrient loads was built and applied to calculate river nutrient loads from untreated rainfall runoff, untreated sewage, and treated recharge into the eutrophic Dianchi Lake from an urban river catchment with limited infrastructure. Nutrient impacts on the lake were evaluated and a load reduction strategy was given a hint to reduce nutrient impacts of urban rivers. During the study period 2014–2016, nutrient loads from the urban river generally decreased except during heavy winter rainfall events and high-intensity pollution events associated with rainfall runoff. The average contribution of annual nutrient loads to the lake capacity indicated the underestimation of nutrient impacts of urban rivers. This approach provides new insights into urban water management and underscores the importance of sewage infrastructure.

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Lifting of biogenic compounds by a riverbed from a municipal drainage basin on a day scale

E3S Web of Conferences ◽

10.1051/e3sconf/20184400042 ◽

2018 ◽

Vol 44 ◽

pp. 00042 ◽

Cited By ~ 1

Author(s):

Anna Fortuniak ◽

Krzysztof HaŁas ◽

MichaŁ GÓrecki ◽

Krzysztof Szewczyk ◽

Angelika Wojtania ◽

...

Keyword(s):

Water Samples ◽

Drainage Basin ◽

Urban River ◽

Nutrient Concentrations ◽

Control Points ◽

River Catchment ◽

Measurement Control ◽

Measurement Series ◽

Biogenic Compounds

Urban river is the object of very dynamic hydrochemical changes. It was decided to trace the variability of physicochemical elements within 24-hour. One of the rivers in ŁÓdŹ – Olechówka – was selected for research, where, having knowledge from previous research, two measurement-control points were established: first located in the middle course of the river (on its quasi-natural fragment), second at its mouth to the recipient. Between these points, the Olechówka River catchment gains significantly on urbanization. A measurement series during 24-hour was carried out at each of the points, during which in situ measurements Q, T, pH, SEC and O2 were taken every 1 hour and water samples were taken for the analytical determinations NO3-, PO43-, NH4+, TN, TP and Susp. With relatively stable hydrological conditions, a twenty-four hour cycle of changes in nutrient concentrations was observed, whose maxima occur during the night hours.

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