主动排水网络的变化及其对水文响应和洪水风险管理过程的影响：弗莱什山区集水区案例研究

IF 3.6 Q2 ENVIRONMENTAL SCIENCES

Resources Pub Date : 2023-12-15 DOI:10.3390/resources12120146

T. Bryndal

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引用次数: 0

摘要

主动排水网（ADN）是集水区的动态组成部分，在集水区的功能中发挥着重要作用。在极端水文气象事件中，主动排水网的变化最为明显，而主动排水网的变化主要源于人为切入。了解 "真实 "的 ADN 参数是集水区水文领域的关键因素，因为 ADN 会影响水文、地貌和生物过程的强度。本研究的目标是评估：(1) 极端水文气象事件期间 ADN 的变化（特别关注人为因素对 ADN 变化的影响）；(2) ADN 变化对集水区水文响应的影响及其对洪水灾害/风险管理过程的影响。这项研究是在一个容易发生山洪的山区集水区进行的。利用 ALS-LiDAR 数据和 GIS 工具重建了 ADN，并使用 SCS-CN 和 GIUH 模型评估了水文响应。研究结果表明，暴雨期间的 ADN 比自然形成的河流排水网（RDN）（11.4 km-km-2 对 2.9 km-km-2）密集三至四倍，而且 RDN 受到人为因素（如道路、沟渠、垄沟等--约占 ADN 的 1/3）的严重影响。此外，ADN 的结构也发生了重大变化，这一点在霍顿人的分析中得到了证实。ADN 的变化影响了集水区的水文响应（主要是洪峰流量增加了 7%）和 1%洪水危险区的面积（增加了约 5%）。由此可以得出结论，在所研究的集水区，ADN 的显著变化对洪水危害等级的变化影响不大。研究结果为我们提供了一个新的视角，让我们了解一个小型飞地山区集水区的洪水危害/风险评估过程。

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Changes in the Active Drainage Network and Their Impact on the Hydrological Response and Flood Risk Management Process: A Case Study for a Flysch Mountain Catchment

The active drainage network (ADN), as a dynamic component of a catchment, plays an important role in a catchment’s functioning. Changes in the ADN are the most noticeable during extreme hydro-meteorological events, and they result from, among others, the incorporation of man-origin incisions into the ADN. Knowledge of the parameters of the “real” ADN is a key element in the field of catchment hydrology because the ADN affects the intensity of hydro-, geomorpho-, and biological processes. The goals of this study are to assess (1) the changes in the ADN during extreme hydro-meteorological events (with special attention paid to the human-induced impact on the ADN transformation) and (2) the consequences of the ADN changes on the hydrological response of a catchment and their impact on the flood hazard/risk management processes. The study was performed in a mountain catchment, prone to flash flood occurrences. The ADN was reconstructed with the use of ALS-LiDAR data using GIS tools, and the hydrological response was evaluated by using SCS-CN and GIUH models. The results revealed that the ADN functioning during heavy rainfalls is three to four times denser than the natural-origin river drainage network (RDN) (11.4 km·km−2 vs. 2.9 km·km−2), and the RDN is significantly modified by human-origin elements (e.g., roads, ditches, furrows, etc.—they constitute ca. 1/3 of the ADN). Moreover, significant structural changes in the ADN have occurred, which were confirmed by the Hortonians’ type of analysis. The changes in the ADN have affected the hydrological response of the catchment (predominantly an increase in the peak flow—up to 7%) and the dimensions of the 1% probable flood hazard zone (increase of ca. 5%). It may be concluded that significant changes in the ADN, in the catchment studied, had a moderate impact on the changes in the flood hazard level. The results give a new insight into the flood hazard/risk assessment processes in a small flysch mountain catchment.

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来源期刊

Resources Environmental Science-Nature and Landscape Conservation

CiteScore

7.20

自引率

6.10%

发文量

审稿时长

11 weeks

期刊介绍： Resources (ISSN 2079-9276) is an international, scholarly open access journal on the topic of natural resources. It publishes reviews, regular research papers, communications and short notes, and there is no restriction on the length of the papers. Our aim is to encourage scientists to publish their experimental and theoretical research in as much detail as possible. Full experimental and methodical details must be provided so that the results can be reproduced. There are, in addition, unique features of this journal: manuscripts regarding research proposals and research ideas will be particularly welcomed, electronic files or software regarding the full details of the calculation and experimental procedure, if unable to be published in a normal way, can be deposited as supplementary material. Subject Areas: natural resources, water resources, mineral resources, energy resources, land resources, plant and animal resources, genetic resources, ecology resources, resource management and policy, resources conservation and recycling.