A hitherto unpublished historical dataset of the Breede River estuary, Western Cape, South Africa, that was collected in the summer season of 1983 is presented. Bathymetric, physiographic, and sedimentological data were collected at 1–1.5-km intervals between the mouth and the Malgas ferry crossing at km 35. The remaining estuary up to km 52 was not surveyed. Sedimentologically, the estuary could be divided into a lower marine sand reach (mouth to km 5), a mixed sand/mud reach (km 5–18.5), and a fluvial sand reach upstream of km 18.5. Hydrological data were collected at three midstream anchor stations (mouth, km 14.5, and km 24) which were occupied for complete tidal cycles. Five parameters were recorded: tidal elevation, current velocity, salinity, temperature, and light transmittance. Pronounced velocity asymmetries of the tides were revealed by phase delays between the times of low (high) water and corresponding slack water (turn of the tide), as well as considerable up-estuary delays in the occurrence of high and low tides. The mode of tidal wave propagation was synchronic (constant height) up to a distance of ~23 km at spring high tide and ~13 km at neap high tide, from where it proceeded in hyposynchronic mode (progressive decrease in height). Peak surface velocities reached 1.5 m/s at Station 1 (mouth), 0.6 m/s at Station 2 (km 14), and 0.45 m/s at Station 3 (km 24). The marine sand reach and parts of the mixed sand/mud and fluvial sand reaches were distinctly flood dominated as revealed by the orientation of bedforms. Salt water intrusion reached up to km 25, where river background levels were reached. Suspended sediment concentrations (turbidity) varied from 55–85 mg/l at the mouth, 65–200 mg/l in the mixed sand/mud reach, and 55–85 mg/l in the fluvial sand reach. At the time of observation, the Breede River estuary was in a well-mixed hydrological state. The fluvial sand reach displayed numerous, up to 18-m-deep scour pools. Grain-size distributions revealed distinct differences between the individual estuary sections, the sand/mud, and marine sand reaches, in particular, being characterized by up to four, mostly mixed hydraulic populations. Offshore seismic profiles suggest that the Duiwenhoks River, located 14 km to the east of the Breede mouth, was a tributary of the latter during Pleistocene sea-level lowstands. From a global perspective, the Breede River estuary conforms physically to typical small estuaries that are only marginally impacted by human interferences.

介绍了迄今为止尚未出版的南非西开普省布雷德河河口的历史数据集，该数据集是在1983年的夏季收集的。在河口和马尔加斯（Malgas）渡轮过境点35公里之间的1-1.5公里间隔处收集了测深，生理和沉积学数据。未调查到52公里以内的其余河口。从沉积学上讲，河口可分为海底沙粒下部（口至5公里），沙/泥沙混合沙体（5-15-18.5公里）和河滩沙质上游（18.5公里）。在三个中游锚点站（口，14.5公里和24公里处）收集了水文数据，这些站被占据了完整的潮汐周期。记录了五个参数：潮汐高度，流速，盐度，温度和透光率。潮汐明显的速度非对称性由低（高）水和相应的松弛水（潮汐转向）之间的相位延迟以及高潮和低潮发生时的明显的上河口延迟所揭示。潮汐传播的方式是同步的（恒定高度），在春季高潮时达到〜23 km，在轻潮时达到〜13 km，从那里开始以低同步模式传播（高度逐渐降低）。1号站（口）的峰值表面速度达到1.5 m / s，2号站（14公里）的峰值表面速度达到0.6 m / s，3号站（24公里）的峰值速度达到0.45 m / s。如床形的方向所揭示的那样，海沙范围以及部分混砂/泥浆和河流相沙范围明显是洪水占主导地位的。盐水入侵达到了25公里，达到了河流的本底水平。悬浮泥沙的浓度（浊度）在口中为55-85 mg / l，在混合沙/泥土中为65-200 mg / l，在河流沙地中为55-85 mg / l。在观察时，布雷德河河口处于水文混杂状态。河流河段显示出众多的深达18米的冲刷池。粒度分布揭示出各个河口段，沙/泥和海沙之间的明显不同，特别是具有多达四个，大多数是混合水力种群的特征。海上地震资料表明，位于布里德河口以东14公里处的Duiwenhoks河是在更新世海平面低位期间后者的支流。从全球角度来看，