Riverbank erosion poses a significant threat to livelihoods and infrastructure in the Vietnamese Mekong Delta (VMD), necessitating innovative and sustainable solutions. This study explores the use of old tyres as a material for embankment construction to stabilize riverbanks, combining physical reinforcement with bioengineering techniques. A pilot project was conducted in Dinh My commune, An Giang Province, where an embankment was constructed using old tyres, geotextile, riprap, and vegetation. Field measurements using the Leica TS02 Plus Total Station and Finite Element Method (FEM) modeling were employed to assess the embankment’s performance. Results indicate that the embankment effectively stabilized the riverbank, with a maximum displacement of 18 mm observed after one year. The FEM predictions closely aligned with the measured data, achieving an accuracy of 68% or higher, validating the model’s accuracy. The integration of vegetation further enhanced stability, demonstrating the potential of this approach as a sustainable and cost-effective solution for riverbank protection. This study highlights the dual benefits of erosion control and waste management, offering a replicable strategy for addressing riverbank erosion across deltaic and lowland regions. The pilot offers a scalable model for climate-resilient infrastructure in deltaic regions globally, linking erosion control with circular economy strategies.

Coastal erosion poses a significant threat to the infrastructure of the coastal community at the mouth of the Ma River in Thanh Hoa Province, Vietnam. In response, emergency solutions such as hard, protective structures are often implemented. However, this approach exacerbates the problem as the underlying mechanisms of coastal erosion are not adequately investigated and understood. In this study, the long-term configuration of the mouth of the Ma River in Thanh Hoa Province, Central Vietnam, is investigated using Landsat imagery spanning from 1987 to 2023. An analytical solution of a one-line model for shoreline change was also used to examine the sand discharge from the Ma River and the diffusion coefficient for the sand transported along the shore by breaking waves. The results showed an asymmetric configuration of the mouth of the Ma River over the past 37 years. The supply of sand from the Ma River is around 350,000 m³/year. The majority of sand (ranging from 55% to 75%) is mainly transported to the northern beach of the Ma River delta. This uneven distribution of sand from the Ma River has led to the asymmetrical morphology of the delta apex in which the northern part of the Ma River delta is experiencing northward movement while the southern part of the Ma River Delta is moving southward and landward. The asymmetrical morphology of the delta at the mouth of the Ma River has recently been identified as the cause of severe coastal erosion. The diffusion coefficient value determined for the transportation of longshore sand along the deltaic lobes of the Ma River delta corresponds to 90 m²/day. This study offers a practical method for investigating morphological changes in cuspate deltas, especially when measured field data are limited.

Riverbank erosion in the Vietnamese Mekong Delta (VMD) poses a serious threat to agricultural lands, infrastructure, and local communities. Conventional protective measures, such as synthetic geotextiles and concrete revetments, are often costly and environmentally disruptive. This study investigates the potential of Eichhornia crassipes, a widely available invasive species, commonly known as water hyacinth (WH), to produce biodegradable geotextiles as a low-cost, nature-based solution (NbS) for small-scale riverbank protection. It is the first to test minimally processed WH mats under simulated tidal conditions in the VMD. Laboratory experiments were conducted to evaluate the geotextile’s (1) sediment retention capacity, (2) wave energy reduction, and (3) mechanical durability under wet–dry cycles. Results show that the WH geotextile effectively reduced sediment resuspension, decreasing turbidity levels from 800 FTU (unprotected scenario) to below 50 FTU. The geotextile also attenuated wave energy, reducing significant wave heights by approximately 35–40%. Mechanical testing revealed that the fish bone weaving pattern with adhesive coating achieved the highest tensile strength (8.36 kN/m after 12 wet–dry cycles), while uncoated samples demonstrated higher elongation (up to 61.67%), providing greater flexibility. These demonstrate the feasibility of WH geotextiles as a scalable nature-based solution for erosion-prone tropical deltas. Future studies should focus on field-scale validation, biodegradation rates, and performance optimization for long-term applications.

Mục tiêu của nghiên cứu này là phân tích ảnh hưởng của các yếu tố địa chất thủy văn và gia tải đến ổn định bờ sông Chà Và, tỉnh Vĩnh Long. Ảnh vệ tinh tải về từ phần mềm Google Earth được sử dụng để đánh giá mức độ sạt lở bờ sông và mức độ đô thị hóa ven sông. Các số liệu sơ cấp và thứ cấp như địa hình, địa chất, thủy văn và sóng tàu được thu thập và phân tích. Hệ số an toàn được sử dụng để phân tích mức độ ổn định bờ sông. Các thông số đầu vào của mô hình được lấy từ các số liệu phân tích các yếu tố địa chất, mực nước, tải trọng sóng và tải trọng do quá trình đô thị hóa. Vận tốc dòng chảy thực đo được so sánh với vận tốc không xói của bùn cát cấu tạo bờ sông để đánh giá khả năng gây xói của vận tốc. Kết quả phân tích cho thấy xói lở và bồi tụ đang diễn ra dọc theo đoạn sông nghiên cứu. Vận tốc dòng chảy là một trong những nguyên nhân gây...

Tình trạng sạt lở bờ sông trên hệ thống kênh rạch nội đồng tỉnh An Giang là một vấn đề nghiêm trọng, gây ảnh hưởng đến đời sống và phát triển kinh tế - xã hội của địa phương. Trong nghiên cứu, phương pháp đánh giá nông thôn có sự tham gia (PRA) được sử dụng kết hợp với điều tra bảng hỏi để xác định các nguyên nhân chính và đề xuất giải pháp phòng chống sạt lở. Kết quả cho thấy các nguyên nhân chủ yếu gồm nền đất yếu, biến động dòng chảy, phát triển giao thông đường bộ, khai thác đất cát và lấn chiếm hành lang an toàn sông. Các giải pháp phòng chống sạt lở được đề xuất theo mức độ khả thi, trong đó tuyên truyền, vận động cộng đồng đạt mức đánh giá cao nhất, tiếp theo là cảnh báo giao thông, kè mềm và quan trắc thường xuyên. Việc kết hợp phương pháp PRA và bảng hỏi giúp đánh giá toàn diện nguyên nhân và giải pháp.

Coastal erosion is threatening the infrastructures of coastal community at the Ma River mouth in Thanh Hoa province, Vietnam. When coastal erosion happens, people try to prevent it by emergency solutions like hard structures. However, this approach usually leads to more severe problem since the mechanism for coastal erosion is not investigated and understood properly. In this study the long-term configuration of Ma River mouth in Thanh Hoa Province, Central Vietnam has been investigated using Landsat imagery from 1987 to 2023. An analytical solution of one-line model for shoreline change was also employed to calculate the sand discharge from Ma River as well as the diffusion coefficient for sand transported along-shore by breaking waves. There was an asymmetric configuration of the Ma River mouth during the last 37 years. The sand supply from the Ma River is around 350,000 m3/year. This amount of sand is going mainly to the northern beach of the Ma River delta (from 55% to 75%). The asymmetric morphology of the Ma River mouth delta is the trigger for severe coastal erosion reported recently. This study provides a quick and easy method to investigate the morphological change of cuspate deltas where measured data is limited.