Study on Water Environment Improvement Effect of Ecological Water Replenishment for Coastal Mountain-Stream Rivers

ZHU Weikun; LIU Huimin; YE Yong

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Study on Water Environment Improvement Effect of Ecological Water Replenishment for Coastal Mountain-Stream Rivers

更新时间：2026-10-13

- Study on Water Environment Improvement Effect of Ecological Water Replenishment for Coastal Mountain-Stream Rivers
- PEARL RIVER Pages: 1-10(2026)
- 作者机构：
  
  1.深圳市大鹏新区住房和建设局，广东深圳 518119
  2.三峡大学水利与环境学院，湖北宜昌 443002
- 作者简介：
- 基金信息：
- DOI：
  CLC： X522;TV143
- Received：04 August 2026，
  
  Revised：2026-09-18，
  
  Accepted：22 September 2026，
  
  Online First：13 October 2026，
- 稿件说明：
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朱炜坤，柳慧敏，叶永.生态补水对滨海山溪型河流水环境改善效应研究［J］.人民珠江，DOI：10.3969/j.issn.1001-9235.XXXX.XX.001.

ZHU Weikun,LIU Huimin,YE Yong.Study on Water Environment Improvement Effect of Ecological Water Replenishment for Coastal Mountain-Stream Rivers[J].PEARL RIVER,
朱炜坤，柳慧敏，叶永.生态补水对滨海山溪型河流水环境改善效应研究［J］.人民珠江，DOI：10.3969/j.issn.1001-9235.XXXX.XX.001. DOI：

ZHU Weikun,LIU Huimin,YE Yong.Study on Water Environment Improvement Effect of Ecological Water Replenishment for Coastal Mountain-Stream Rivers[J].PEARL RIVER, DOI：10.3969/j.issn.1001-9235...001.

摘要

滨海山溪型河流普遍存在旱季基流匮乏、潮汐往复扰动显著、氮素内源富集突出等问题，单一水源生态补水模式难以实现全年水质稳定达标，而双水源协同控氮作用机制与时序响应规律尚不明确。以深圳西涌河为研究对象，基于2022年全年逐月水文、地形、潮汐、水质多源原位监测数据，构建MIKE21二维水动力-水质耦合模型，通过多断面分季节水位、总氮实测数据完成模型率定与验证（水位纳什效率系数NSE＞0.75，水质模拟相对误差＜12%）。设置无补水、单一水库补水、水库耦合单厂再生水、水库耦合双厂再生水4类模拟工况，从流场滞水区演变特征、总氮空间分布格局、水质改善效率、达标水域占比四个维度，量化分析不同补水模式的水环境改善效应，探究1～3个月连续补水的时序演变规律及四季水质改善差异性。结果表明：双水源联合补水可协同发挥水力置换与低浓度再生水稀释的双重增效作用，在最优工况（水库补水0.10 m³/s+双厂再生水补水0.12 m³/s）下，流域总氮综合改善率达29.5%，地表水Ⅲ类达标水域占比由22%提升至80%；水质改善效果与补水时长呈显著正相关，连续3个月稳态补水为河道水质稳定达标的临界时长；受低温环境、监测揭示的底泥内源氮释放现象及潮汐顶托叠加效应影响，冬季枯水期水质治理效能显著低于丰、平水期。本研究阐明了潮汐扰动下山溪河流双水源补水的时序控氮机理，可为华南地区同类滨海河道生态补水长效调度与水质精细化管控提供技术支撑。

Abstract

Mountain-stream rivers in coastal areas commonly face issues such as low base flow during dry seasons

significant tidal fluctuations

and prominent internal nitrogen enrichment

making it difficult to achieve year-round stable water quality through a single water source ecological replenishment model. The mechanisms and temporal response patterns of dual water source collaborative nitrogen control remain unclear. Taking the Xichong River in Shenzhen as the study site

a MIKE21 two-dimensional hydrodynamic-water quality coupling model was constructed based on monthly hydrological

topographic

tidal

and water quality multi-source in-situ monitoring data from 2022. Model calibration and validation were completed using measured data of water level and total nitrogen across multiple cross-sections by season (Nash efficiency coefficient for water level

0.75

relative error for water quality simulation

12%). Four simulation scenarios were designed: no replenishment

single reservoir replenishme

reservoir-coupled single plant reclaimed water

and reservoir-coupled dual plant reclaimed water. From four dimensions—evolution characteristics of flow field stagnant zones

spatial distribution patterns of total nitrogen

water quality improvement efficiency

and proportion of compliant water bodies—quantitative analysis was conducted on the water environment improvement effects of different replenishment modes

exploring the temporal evolution patterns of continuous replenishment (1–3 months) and seasonal differences in water quality improvement. Results show that dual water source joint replenishment can synergistically enhance hydraulic displacement and low-concentration reclaimed water dilution effects. Under the optimal scenario (reservoir replenishment 0.10 m

/s + dual plant reclaimed water replenishment 0.12 m

/s)

the comprehensive improvement rate of total nitrogen in the watershed reached 29.5%

and the proportion of surface water compliant with Class III standards increased from 22% to 80%. Water quality improvement efficacy is significantly positively correlated with replenishment duration

with continuous 3-month steady replenishment being the critical threshold for stable river water quality compliance. Due to low-temperature environments

monitored phenomena of sediment internal nitrogen release

and tidal backflow effects

water quality management efficacy during winter dry seasons is significantly lower than in flood and average flow periods. This study elucidates the temporal nitrogen control mechanism of dual water source replenishment in tidal-influenced mountain-stream rivers

providing technical support for long-term ecological replenishment scheduling and refined water quality management of similar coastal rivers in South China.

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references

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