Recommended applications of geomembranes for artificial lakes

The core of artificial lake seepage control projects lies in the scientific selection and standardized construction of the geomembrane, as its quality directly determines the seepage control effect and the long-term service life of the landscape lake. Based on engineering practice and material characteristics, the following are professional recommendations for geomembranes used in artificial lake seepage control.

Currently, high-density polyethylene (HDPE) geomembranes are the most widely used in the field of artificial lake seepage control, as they have become the preferred material due to their excellent comprehensive performance. HDPE geomembrane possesses extremely strong resistance to chemical corrosion, tolerating the erosion of acids, alkalis, microorganisms, and various impurities in water, making it suitable for various water quality environments such as artificial lakes and landscape water features. Its high tensile strength and large elongation at break effectively accommodate the settlement and deformation of the artificial lake foundation, preventing membrane tearing due to soil displacement. Simultaneously, HDPE geomembrane has an extremely high impermeability coefficient, reaching the order of 10^-17 cm/s, fully meeting the seepage prevention standards for zero or minimal leakage in artificial lakes. Furthermore, the material is non-toxic and environmentally friendly, causing no pollution to the water body or surrounding ecosystem, thus meeting the ecological requirements of landscape engineering.

The thickness selection must be precisely chosen based on the water depth, area, and intended use of the artificial lake. For small to medium-sized artificial lakes with a water depth of 1-3 meters, a 1.5mm thick HDPE geomembrane is recommended, balancing seepage prevention performance with cost control. For artificial lakes with a water depth exceeding 3 meters or where large aquatic animals are present, it is suggested to upgrade to a 2.0mm thick HDPE geomembrane to enhance the membrane's resistance to punctures and impacts. If the artificial lake is located in a high-altitude, cold region with high UV radiation, a specialized HDPE geomembrane with added UV stabilizers and anti-aging agents should be selected to extend the material's outdoor service life.

The construction process is crucial to ensuring effective seepage prevention. Before laying the membrane, the lakebed foundation must be leveled and compacted, and sharp debris such as stones and tree roots must be removed. During laying, the membrane should be laid loosely, allowing for deformation, to avoid excessive tension. Membrane welding must employ a double-track hot-melt welding process, ensuring the weld strength is no less than 80% of the base material strength. Each weld must pass an air-filling test; only welds without leaks are considered合格 (qualified). After laying, a protective layer should be promptly laid on top of the membrane. This layer can be made of non-woven geotextile, sand, or fine gravel to prevent damage from subsequent landscaping and aquatic plant planting.

Furthermore, if the artificial lake is positioned as a supporting facility for an ecological wetland park, it can be used in combination with bentonite geotextile (GCL) and HDPE geomembrane to form a dual seepage prevention system, further enhancing seepage prevention reliability. After construction, a water-filling test should be conducted, with water injected in stages and leakage monitored to ensure compliance with design standards.

By scientifically selecting HDPE geomembrane and strictly adhering to construction specifications, a robust seepage barrier can be built for artificial lakes, ensuring the long-term balance between landscape effects and ecological benefits.