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根据珠江三角洲网河区的特点,收集珠江三角洲“94·6”、“98·6”、“05·6”、“08·6”等几场大洪水的水位流量资料和各潮水位站点年系列高高潮资料,分析近20年来珠江三角洲水位变化情况。分析得出:珠江三角洲20世纪90年代腹部水道普遍出现超历史最高水位,网河区出现水位异常壅高现象,严重威胁城市的安全;进入21世纪,珠江三角洲大部分地区潮位有所下降,下降幅度从西、北江三角洲入口马口、三水向东南沿海地区减小,到广州河段和西部河口地区,潮位反而有所抬升。由于珠江三角洲网河区河床下切直接导致洪(潮)水位普遍下降,但从下降幅度来看极不平衡,入口河段和出海口门下降幅度较大,而网河区腹部则下降幅度小,仍维持较高洪水位。
According to the characteristics of the Pearl River Delta region, we collected the water level of several major floods such as “94.6”, “98.6”, “05.6” and “08.6” in the Pearl River Delta Flow data and tide level annual series of high tide site data, analysis of the Pearl River Delta nearly 20 years of water level changes. The analysis shows that in the Pearl River Delta, the superabundance of the abdomen watercourse generally occurs in the 1990s and the water level anomaly is extremely high in the network area, which seriously threatens the safety of the city. In the 21st century, the tide level of most areas of the Pearl River Delta decreased and dropped The magnitude of the tidal range increased from the entrance to the west and the Beijiang Delta to the mouth of the mouth and the decrease of Sanshui to the southeastern coastal areas, but to the Guangzhou reach and western estuary. Due to the general decrease of flood (tide) water level in the riverbed of the Pearl River Delta, it is extremely unbalanced from the point of view of decline, with a larger drop in the inlet and outlet ports, Still maintain a higher flood level.