The Wang River is one of the major tributaries of the Chao Phraya River (CPR) system in Thailand as the key riverine sediment source supplying the Chao Phraya Delta that has experienced severe shoreline retreat in the past six decades. Historical and observed river flow and sediment data measured during 1929–2019 were used to assess the variation in total sediment load along the Wang River and evaluate the effects of three major dam constructions on sediment supplied from the Wang River to the CPR. Results indicated that sediment loads increased toward downstream. Variation in long-term total sediment load (TSL) along the river suggested that construction of the Kiew Lom Dam in 1972 did not cause a reduction in sediment yield in the Wang River Basin because it impounded less than 20% of the average annual runoff, while the Mae Chang and Kiew Koh Ma Dams caused downstream sediment reduction. These three dams are located in the upper and middle river basins, and their effects on sediment load in the Wang River are ameliorated by additional sediment supplied from the lower basin. Results confirmed that construction of these three major dams in the Wang River did not greatly impact sediment supply from the Wang River to the CPR system. The dam site and sediment load variation along the river are the primary factors controlling the impact of the dam construction.

中文翻译：

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旺河大坝建设对湄南河流域沉积物状况的影响

旺河是泰国湄南河 (CPR) 系统的主要支流之一，是供应湄南河三角洲的主要河流沉积物源，湄南河三角洲在过去的 60 年中经历了严重的海岸线后退。1929 年至 2019 年期间测量的历史和观测河流和泥沙数据用于评估沿汪河总泥沙负荷的变化，并评估三个主要大坝建设对从汪河向 CPR 供应的泥沙的影响。结果表明沉积物负荷向下游增加。沿河长期总含沙量 (TSL) 的变化表明，1972 年建造的 Kiew Lom 大坝并没有导致旺河流域的泥沙产量下降，因为它蓄积了不到年平均径流的 20%，而 Mae Chang 和 Kiew Koh Ma 大坝导致下游沉积物减少。这三座大坝位于上流域和中流域，通过下流域补充的泥沙，它们对汪河泥沙负荷的影响得到了改善。结果证实，在望河建设这三个大坝对从望河到 CPR 系统的泥沙供应没有太大影响。坝址和沿河泥沙负荷变化是控制大坝建设影响的主要因素。结果证实，在望河建设这三个大坝对从望河到 CPR 系统的泥沙供应没有太大影响。坝址和沿河泥沙负荷变化是控制大坝建设影响的主要因素。结果证实，在望河建设这三个大坝对从望河到 CPR 系统的泥沙供应没有太大影响。坝址和沿河泥沙负荷变化是控制大坝建设影响的主要因素。