Hongshui River Basin in Southwestern China is the main sediment source of the Pearl River. In order to determine the features of sediment load and its influencing factors in the basin from 1955 to 2016, this study identified three periods of sediment load change by using rank order cluster analysis, and calculated the contribution of average precipitation, water yield capacity, and sediment concentrations to the change of sediment load by means of sediment source attribution. On this basis, the main factors affecting the change of sediment load were further analyzed. The results suggest that 1963 and 1991 were the two turning points of sediment load at the Qianjiang Station in the basin. Due to the variation of sediment concentration, sediment load changed greatly before and after these two points, and human activities were the main driving force of the change of sediment load in this basin. During 1955-1991, the increase of sediment load in the Hongshui River was mainly caused by the increase of soil erosion as a result of deforestation and reclamation in the basin. From 1964 to 2016, 83.49% of the total sediment load reduction was caused by reservoir construction, while the increase of vegetation coverage contributed 12.03% to the decrease of sediment load in the same period. Comparing the results of the WaTEM/SEDEM model with the above results, it is also found that reservoir construction accounted for the vast majority (81.03%) of the total reduction between 1964 and 2016, while the contribution of land-use change to the reduction of sediment load was relatively small (18.97%).
. 红水河流域输沙量变化及其影响因素[J]. 地理科学进展,
2019, 38(5): 772-782.
ZHU Chenyi et al
. Change of sediment load and its influencing factors in the Hongshui River Basin in Southwestern China[J]. PROGRESS IN GEOGRAPHY,
2019, 38(5): 772-782.
<p>黄河于150 ka BP切穿三门峡，东流入海。黄河泥沙90%来自黄土高原。黄土高原土地利用和植被的变化对黄河输沙有决定性的影响。15万年以来，黄河进入华北平原的泥沙约70 000×10<sup>8</sup> t，其中10 ka BP以前占80%。10 ka BP以后的输沙量中，最后1040年黄土高原滥垦时期占60%。黄河泥沙的归宿，建造华北大平原占73%，流入海洋占26%。现在，黄河每年流入北黄海的泥沙不足0.2×10<sup>8 </sup> t，其输运主要受海洋环流系统的影响。现在黄海每年向东海输运悬浮沉积物0.2×10<sup>8</sup>~0.3×10<sup>8</sup> t，主要为废黄河三角洲及水下三角洲受侵蚀再悬浮的黄河泥沙。1996—2000年黄河下游连年断流，利津站的年径流量和输沙量只有1950—1979年30年平均的19%左右。今后20~30年内，由于气候变暖、工业、城市等引黄水量增加，黄河的入海泥沙量仍将偏少。</p>
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