Modelling the hydrological processes of a Chinese lowland polder and identifying the key factors using an improved PHPS model
Modelling the hydrological processes of a Chinese lowland polder and identifying the key factors using an improved PHPS model
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使用改进的 PHPS 模型对中国低地圩田的水文过程进行建模并确定关键因素
DOI：
10.1016/j.jhydrol.2019.124083
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发表时间：
2019-11
影响因子：
6.4
通讯作者：
Jiacong Huang
中科院分区：
文献类型：
--
作者：
Renhua Yan;Junfeng Gao;Jiacong Huang
在风险管理中迫切需要改进水文过程模拟和确定决定因素，以减少圩田水问题造成的社会经济损失。本文改进了低地圩区水文磷模拟系统（简称PHPS2.0），并以中国东南部的建伟圩区为例，利用PHPS2.0模型和实测数据，对该圩区的土壤磷素动态进行了研究，结果表明：摘要采用提升回归树（BRT）算法对影响圩田流量和磷输出量时间变化的关键因素进行了研究。结果表明，PHPS2.0模拟的流量、地表水和磷与实测值吻合较好。由于考虑了田间尺度的磷素动态，模型的性能得到了显著提高。水和磷平衡表现出显着的季节变化，特别是在施肥，作物收获和排放方面。流域流量的时间变化主要取决于降水和蒸发，这两个因素占流量变化的63.7%。相反，磷输出的时间变化是由作物覆盖和施肥决定的，占磷变化的75.4%。为减少磷向下游淡水的流失，建议保留农作物残体，减少磷化肥的过度使用，并制定应急预案。该研究扩展了对圩区环境因子与水文过程关系的认识，为污染控制提供了指导。
Improved hydrological processes simulation and identification of determinants are urgently needed in risk management to reduce socio-economic losses resulting from polder water problems. This paper improved the lowland Polder Hydrology and Phosphorus modelling System (called PHPS2.0) by coupling the PHPS, Modified Universal Soil Loss Equation (MUSLE), and Integrated Catchments model of Phosphorus dynamics (INCA-P).Then, based on the PHPS2.0 and data collected from the Jianwei polder in southeastern China, a boosted regression tree (BRT) algorithm was used to explore the key factors determining the temporal variations in polder discharge and phosphorus export. The results showed that PHPS2.0achieved excellent agreements between the simulated and observed discharge, surface water and phosphorus. The model performance was significantly improved because field-scale phosphorus dynamics were considered. The water and phosphorus balances exhibited substantial seasonal changes, especially in terms of fertilization, crop harvest, and discharge. The temporal change in catchment discharge mainly depended on precipitation and evaporation, which accounted for 63.7% of the discharge variations. In contrast, the temporal variation in phosphorus export was determined by the crop cover and fertilizer application, which accounted for 75.4% of the phosphorus variation. To mitigate the phosphorus loss to downstream freshwater, it is recommended to remain crop residues, reduce the overuse of phosphorus chemical fertilizers, and draft emergency plans. This study expands the knowledge of the relationship between polder environmental factors and hydrological processes and provides guidance for pollution controls.
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DOI：
--
发表时间：
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期刊：
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影响因子：
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