VIC-AMBHAS input files for the Philippine Hydrological Model

The Philippine Hydrological Model is the first national-scale hydrological model of the Philippines (Scheidegger et al 2023, 2024, 2025). Its primary purpose is to quantify components of the hydrological cycle at the national level, with spatio-temporal patterns of precipitation, evapotranspiration, runoff and groundwater recharge as model outputs.

We have developed an integrated surface water-groundwater model based on the Variable Infiltration Capacity (VIC) macro-scale hydrological model (Liang et al. 1994, Hamman et al 2018), into which we have added a one-layer, 2D lateral groundwater flow model (Scheidegger et al. 2021). Groundwater recharge is derived from the interaction of the groundwater model with the VIC soil by allowing bi-directional exchange of water between the aquifer and the soil. The model is run at a 2 km grid resolution and is parameterised with, and driven by, globally available datasets describing the land surface, including soil and vegetation properties.

The model outputs include: evapotranspiration, runoff, groundwater recharge, baseflow, groundwater levels, and soil moisture.

The resulting modelling framework provides a means to develop understanding of the water resources across the Philippines and aims to support future national water resources planning.

Development of the Philippine Hydrological model began under the ‘Philippines Groundwater Outlook (PhiGO)’ project - a collaboration between the British Geological Survey (BGS), Ateneo de Manila University (ADMU), and the Philippine’s National Water Resources Board (NRWB). The project was joint-funded under the NERC-Newton and DOST-PCIEERD programme, understanding the impacts of hydrometeorological hazards in Southeast Asia (project NE/S003118/1). Under PhiGO, models of Panay and Pampanga were developed. Using subsequent funding from BGS’s International Geoscience Research and Development (IGRD) programme the model was then expanded to cover the whole of the Philippines. The latest developments have been undertaken under the Philippine Hydro Hub, a collaboration between the University of the Philippines Diliman, Ateneo de Manila University and the British Geological Survey. This work has been funded by the UK Department for Science Innovation and Technology's International Science Partnerships Fund in partnership with the British Council.

To run this model the VIC-AMBHAS-GRID version of the code is used, accessed here: https://github.com/BritishGeologicalSurvey/VIC/blob/VIC-AMBHAS-GRID/vic/extensions/AMBHAS/readme.md

More info can be found here:

https://philippinehydrohub.org/news-events/blogs/what-next-for-a-hydrological-model-of-the-philippines.html

https://mapapps.bgs.ac.uk/philippines-national-hydrological-model/?_ga=2.111079430.2018701401.1774525884-1014372910.1774525884

References:

Hamman, J J, Nijssen, B, Bohn, T J, Gergel, D R and Mao, Y X 2018. The Variable Infiltration Capacity model version 5 (VIC-5): infrastructure improvements for new applications and reproducibility. Geoscientific Model Development 11(8), 3481-3496, https://doi.org/10.5194/gmd-11-3481-2018.

Scheidegger, Johanna. 2025 Future projections of the hydrology of the Philippines : dataset summary. Nottingham, UK, British Geological Survey, 28pp. (OR/25/010) (Unpublished)

Scheidegger, Johanna. 2024 User guide : BGS Philippine National Hydrological Model dataset. British Geological Survey, 45pp. (OR/24/023)

Scheidegger, Johanna; Barkwith, Andrew; Jackson, Christopher; Mansour, Majdi; Guzman, Aileen. 2023 Philippine National Hydrological Model. British Geological Survey, 12pp. (OR/23/053) (Unpublished)

Scheidegger, Johanna M.; Jackson, Christopher R.; Muddu, Sekhar; Tomer, Sat Kumar; Filgueira, Rosa. 2021 Integration of 2D Lateral Groundwater Flow into the Variable Infiltration Capacity (VIC) Model and Effects on Simulated Fluxes for Different Grid Resolutions and Aquifer Diffusivities. Water, 13 (5), 663. 10.3390/w13050663

菲律宾水文模型（Philippine Hydrological Model）是菲律宾首个国家级水文模型（Scheidegger等，2023、2024、2025）。其核心目标是在国家尺度量化水文循环各组分，模型输出涵盖降水、蒸散发、径流与地下水补给的时空分布格局。

本研究基于可变下渗容量（Variable Infiltration Capacity, VIC）大尺度水文模型（Liang等，1994；Hamman等，2018）开发了一套地表-地下水耦合模型，并新增一层二维侧向地下水流模块（Scheidegger等，2021）。通过允许含水层与土壤间双向水交换，基于地下水流模块与VIC土壤模块的交互过程推导地下水补给量。该模型以2公里网格分辨率运行，参数化与驱动数据均来自全球公开的陆面数据集，包含土壤与植被属性信息。

模型输出结果包括：蒸散发、径流、地下水补给、基流、地下水位与土壤湿度。

这套建模框架为理解菲律宾全国水资源状况提供了分析手段，旨在为未来国家水资源规划提供支撑。

菲律宾水文模型的开发始于“菲律宾地下水展望（Philippines Groundwater Outlook, PhiGO）”项目，该项目由英国地质调查局（British Geological Survey, BGS）、马尼拉雅典耀大学（Ateneo de Manila University, ADMU）以及菲律宾国家水资源委员会（National Water Resources Board, NRWB）合作开展，由自然环境研究委员会-牛顿基金（NERC-Newton）与菲律宾科学技术部-工业、能源与新兴技术研究发展理事会（DOST-PCIEERD）联合资助，项目主题为理解东南亚水文气象灾害的影响（项目编号NE/S003118/1）。在PhiGO项目框架下，团队先后开发了班乃岛与邦板牙地区的水文模型。后续借助英国地质调查局国际地质科学研究与发展（International Geoscience Research and Development, IGRD）项目的资助，模型被扩展至覆盖菲律宾全境。最新的模型迭代工作由菲律宾水文枢纽（Philippine Hydro Hub）牵头实施，该合作机构包含菲律宾大学迪利曼分校、马尼拉雅典耀大学与英国地质调查局，项目资金由英国科学、创新与技术部（UK Department for Science Innovation and Technology）的国际科学合作基金与英国文化协会（British Council）联合提供。

运行该模型需使用VIC-AMBHAS-GRID版本的代码，访问地址为：https://github.com/BritishGeologicalSurvey/VIC/blob/VIC-AMBHAS-GRID/vic/extensions/AMBHAS/readme.md

更多信息可通过以下链接获取：
https://philippinehydrohub.org/news-events/blogs/what-next-for-a-hydrological-model-of-the-philippines.html
https://mapapps.bgs.ac.uk/philippines-national-hydrological-model/?_ga=2.111079430.2018701401.1774525884-1014372910.1774525884

参考文献：
Hamman, J J, Nijssen, B, Bohn, T J, Gergel, D R 及 Mao, Y X 2018. 《可变下渗容量模型第5版（VIC-5）：面向新应用与可重复性的基础设施改进》. 地球科学模型开发 11(8), 3481-3496, https://doi.org/10.5194/gmd-11-3481-2018.

Scheidegger, Johanna. 2025 《菲律宾水文未来预估：数据集摘要》. 英国诺丁汉，英国地质调查局，28页. (OR/25/010)（未出版）

Scheidegger, Johanna. 2024 《用户指南：BGS菲律宾国家水文模型数据集》. 英国地质调查局，45页. (OR/24/023)

Scheidegger, Johanna; Barkwith, Andrew; Jackson, Christopher; Mansour, Majdi; Guzman, Aileen. 2023 《菲律宾国家水文模型》. 英国地质调查局，12页. (OR/23/053)（未出版）

Scheidegger, Johanna M.; Jackson, Christopher R.; Muddu, Sekhar; Tomer, Sat Kumar; Filgueira, Rosa. 2021 《将二维侧向地下水流集成至可变下渗容量（VIC）模型及不同网格分辨率与含水层扩散度下模拟通量的影响》. 水 13(5), 663. 10.3390/w13050663