Dynamic modeling of the Ganga river system: impacts of future climate and socio-economic change on flows and nitrogen fluxes in India and Bangladesh.

Dynamic modeling of the Ganga river system: impacts of future climate and socio-economic change on flows and nitrogen fluxes in India and Bangladesh.
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恒河系统的动态建模:未来气候和社会经济变化对印度和孟加拉国流量和氮通量的影响。

DOI:
10.1039/c4em00616j
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发表时间:
2015
期刊:
Environmental science. Processes & impacts
影响因子:
--
通讯作者:
Whitehead PG
Whitehead PG
中科院分区:
--
文献类型:
--
作者:
Whitehead PG

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本研究探讨了未来气候和社会经济变化对恒河水系流量和氮通量的潜在影响。这是第一个流域尺度的水质研究恒河考虑气候变化在25公里的分辨率与社会经济情景。采用修正后的动态过程印加模型对复杂多支流流域的水文水质进行了模拟。研究中使用的所有气候认识都预测到2050年代温度和降雨量将增加,到2090年代将显着增加。这些变化导致季风流量增加,地下水补给和灌溉用水增加,但也导致洪水更加频繁。由于稀释增加,预计硝酸盐和氨的浓度会降低。不同的未来社会经济情景被认为对恒河下游端的水质有重大影响。由于人口增长、土地使用变化、污水处理排放增加、大气氮沉降增加和水抽取等压力,未来的可持续性较差导致水质恶化。然而,在恒河清洁计划中设想的更可持续的战略下,水质得到了改善。
This study investigates the potential impacts of future climate and socio-economic change on the flow and nitrogen fluxes of the Ganga river system. This is the first basin scale water quality study for the Ganga considering climate change at 25 km resolution together with socio-economic scenarios. The revised dynamic, process-based INCA model was used to simulate hydrology and water quality within the complex multi-branched river basins. All climate realizations utilized in the study predict increases in temperature and rainfall by the 2050s with significant increase by the 2090s. These changes generate associated increases in monsoon flows and increased availability of water for groundwater recharge and irrigation, but also more frequent flooding. Decreased concentrations of nitrate and ammonia are expected due to increased dilution. Different future socio-economic scenarios were found to have a significant impact on water quality at the downstream end of the Ganga. A less sustainable future resulted in a deterioration of water quality due to the pressures from higher population growth, land use change, increased sewage treatment discharges, enhanced atmospheric nitrogen deposition, and water abstraction. However, water quality was found to improve under a more sustainable strategy as envisaged in the Ganga clean-up plan.
评估气候变化和社会经济变化对恒河系统流量和磷通量的影响。
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