Groundwater quality model is composed of problems of groundwater flow and dynamic dispersion.

地下水水质模型是由水流问题和水动力弥散问题耦合而成。

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BP network model of groundwater quality assessment based on the calculation of BP neural network is presented.

阐述了人工神经网络基本原理，介绍了BP网络的地下水水质评价模型。

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To plot up and set up rational groundwater protection area is an important method for protection of groundwater quality.

科学地划分和建立水源地保护区是保护地下水水质的重要手段。

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Trees can also improve water quality around farms by removing pollutants from soil and groundwater.

VOA: special.2009.09.08

But despite this, knowledge about the impact of climate change on groundwater quantity and quality is limited.

UNESCO: THEMES

In developing the thematic area, UNESCO is a leader in the areas of: transboundary surface and groundwater, water quality, integrated water resource management and climate change adaptation and water.

UNESCO: at the Sixth World Water Forum

The degradation of water quality in surface and groundwater systems is further exacerbating water scarcity and negatively impacting our natural environment and the ecosystem services and goods that it provides, jeopardizing food security and livelihoods.

UNESCO: World Water Day 22 March 2010: Clean Water for a Healthy World