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在珠江三角洲的范围之内,雨水很丰富,地表水也很充足,似乎在这里的地下水也应该是很丰富的,事实上却不是我们所推想的这样简单。作者曾去广州、江门、番禹、顺德和新会等处,在这些地带到处可以看到不高的侵蚀残山,也可以看到一些剥蚀面和两级显明的阶地。它与黄河三角洲和长江三角洲有本质上的区别,黄河三角洲和长江三角洲都是堆积平原,都有很厚的第四纪堆积,并含有大量的地下水。而珠江三角洲是侵蚀堆积平原,没有很厚的第四纪堆
Within the limits of the Pearl River Delta, there is abundant rainfall and plenty of surface water. It seems that groundwater here should also be very rich. In fact, it is not as simple as we might think. The authors went to places such as Guangzhou, Jiangmen, Panyu, Shunde and Xinhui where low eroded canyons can be seen everywhere and some eroded surfaces and two distinct terraces can be seen. It is essentially different from the Yellow River Delta and the Yangtze River Delta. Both the Yellow River Delta and the Yangtze River Delta are plains with thick Quaternary deposits and large amounts of groundwater. The Pearl River Delta is eroded plains, there is no very thick Quaternary heap