To address the low dewatering efficiency and prolonged occupation period of traditional dredged sludge yards

a novel ring-type tube stockyard sludge storage and dewatering technology was proposed. Long-term laboratory experiments were conducted to investigate the dewatering dynamics

focusing on the synergistic effects of geotextile filters and dimensional parameters. The mathematical expressions for each stage of the sludge dewatering process in the ring-type tube stockyard were clarified. The results indicate that in a double-layer ring-type tube stockyard without a geotextile membrane

the sludge dewatering process consists of three stages: solid-liquid separation

seepage

and evaporation

which change linearly

exponentially

and linearly

respectively. In a double-layer ring-type tube stockyard with a geotextile membrane

the sludge dewatering process is divided into four stages. The dewatering rates in the solid-liquid separation and seepage stages are significantly accelerated

leading to improved overall dewatering efficiency. Mechanistically

this acceleration results from the geotextile membrane’s effectiveness in preventing solid sludge particles from clogging the inter-thread gaps in the ring-type tubes. In an eight-layer ring-type tube stockyard

the sludge dewatering process is divided into five stages

introducing a linear change stage of sudden settlement compared to the double-layer stockyard. The mathematical descriptions of the other stages are similar to those of the double-layer stockyard. As the ratio of yard height to inner diameter increases

the sludge settlement distribution takes on an “inverted cone” shape

with maximum settlement occurring at the center

thereby enhancing overall dewatering efficiency. These findings are crucial for the efficient utilization of limited storage space for dredged sludge.