Enhancing water management in Northern European lowland chalk streams: A parsimonious, high-resolution hydrological model using groundwater level as a proxy for baseflow

IF 4.7 2区 地球科学 Q1 WATER RESOURCES
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Abstract

Study region

The River Frome, a chalk stream in West Dorset, UK.

Study focus

High-resolution hydrological models are required to integrate with the current wave of high-frequency data and advance our understanding of pollutant sources, pathways, and sinks. This presents several challenges in chalk streams, as their high-permeability and unique hydrogeological characteristics often leads to complex models that are overparameterized and computationally burdensome. In this article, we develop a novel and parsimonious modelling approach to describe the surface hydrology for a chalk stream in high resolution (15-minute frequency, ≤ 100 m cross-section spacing), using groundwater levels as a proxy for spring discharges.

New hydrological insights for the region

Our results show that chalk stream dry-weather flows can be simulated accurately and parsimoniously at high-resolution (Nash-Sutcliffe efficiency = 0.97, mean relative error = 2.86 %, for a five-year period). We also show that spring discharges are the dominant form of flow accretion in all seasons and are critical to dilute sewage treatment inputs during the ecological growing season, whilst runoff and quick-flow pathways in the river valley corridor contribute a small proportion to annual flow accretion (< 5.2 %). Due to its simplicity and few parameters to calibrate, this modelling approach has broad applicability in lowland permeable catchments. Management implications include expeditious investigations of high-resolution freshwater quality responses to pollution and informing abstraction limits to sustain robust ecological conditions.
加强北欧低地白垩溪流的水资源管理:使用地下水位作为基流替代物的简易高分辨率水文模型
研究区域英国西多塞特郡的白垩溪流弗罗姆河。研究重点需要高分辨率水文模型来整合当前的高频数据浪潮,并推进我们对污染物来源、途径和汇的了解。白垩溪流的高渗透性和独特的水文地质特征往往导致模型过于复杂,参数过高,计算负担过重,这给白垩溪流的研究带来了诸多挑战。在本文中,我们开发了一种新颖、简洁的建模方法,利用地下水位作为春季排水量的代表,以高分辨率(15 分钟频率,断面间距≤ 100 米)描述白垩溪的地表水文。我们的研究还表明,春季排放是所有季节流量增加的主要形式,对稀释生态生长季节的污水处理输入量至关重要,而河谷走廊的径流和快速流动途径对年流量增加的贡献很小(5.2%)。由于这种建模方法简单且需要校准的参数较少,因此在低地透水集水区具有广泛的适用性。对管理的影响包括:快速调查高分辨率淡水水质对污染的反应,并告知取水限制,以维持稳健的生态条件。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Hydrology-Regional Studies
Journal of Hydrology-Regional Studies Earth and Planetary Sciences-Earth and Planetary Sciences (miscellaneous)
CiteScore
6.70
自引率
8.50%
发文量
284
审稿时长
60 days
期刊介绍: Journal of Hydrology: Regional Studies publishes original research papers enhancing the science of hydrology and aiming at region-specific problems, past and future conditions, analysis, review and solutions. The journal particularly welcomes research papers that deliver new insights into region-specific hydrological processes and responses to changing conditions, as well as contributions that incorporate interdisciplinarity and translational science.
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