In the Tianjin Port 8·12 explosion, the leakage of enormous amounts of nitrate into the coastal soil-water system threatened the environment and human health. This work aimed to assess the nitrate transport process in unsaturated dredger fills and to conduct an environmental risk assessment to establish guidelines that safeguard groundwater against contamination. The impacts of the bulk density, initial water content, recharge rate, and initial concentration of the nitrate transport process were investigated through an L₉ (3⁴) matrix. A field simulation was conducted with Hydrus-1D to explore nitrate transport at the accident site. The results showed the recharge rate and initial water content were the dominant factors affecting the nitrate transport rate and concentration distribution, followed by the initial concentration and bulk density. The contaminant reached the water table in approximately 1.2 years and that approximately 9% of the leaked nitrate entered the aquifer after two years, while the rest of the nitrate remained in the unsaturated zone. The nitrate concentration at a depth of 5.0 m was nearly 1000 mg L^–1, which was much higher than the groundwater concentration standard of 30 mg L^–1. The soil and groundwater quality warrant special attention due to the excessive nitrate contaminants.

在天津港8·12爆炸中，大量硝酸盐泄漏到沿海土壤-水系统中，威胁到环境和人类健康。这项工作旨在评估非饱和挖泥船中硝酸盐的运输过程，并进行环境风险评估，以建立保护地下水免受污染的准则。通过L ₉（3 ^4）研究了堆密度，初始水含量，补给率和硝酸盐运输过程初始浓度的影响。）矩阵。用Hydrus-1D进行了现场模拟，以探索事故现场的硝酸盐迁移情况。结果表明，补给率和初始含水量是影响硝酸盐迁移率和浓度分布的主要因素，其次是初始浓度和堆积密度。污染物在大约1.2年内到达地下水位，并且大约9％的泄漏硝酸盐在两年后进入含水层，而其余硝酸盐保留在非饱和区。深度为5.0 m时的硝酸盐浓度接近1000 mg L ^–1，远高于地下水浓度标准30 mg L ^–1。由于过多的硝酸盐污染物，土壤和地下水的质量值得特别注意。