170 
PACIFIC SCIENCE, Vol. XXII, April 1968 
TABLE 10 
Beach Sand Reservoirs, Miscellaneous 
Coastal Zones, Lanai 
COASTAL ZONE* 
SUMMATION 
OF BEACH 
LENGTHS 
( yards ) 
AVERAGE 
SAND 
VOLUMEf 
1 0 3 yd 3 
Kuahua-Halulu 
2300 
92.0 
Halulu-Hauola 
5800 
232.0 
Hauola— Kapoho 
10,700 
428.0 
Manele 
500 
30.0 
Manele-Hulopoe 
75 
4.5 
Polihua-Hale o Lono 
1600 
192.0 
Hale o Lono-Kuahua 
4800 
192.0 
* Listed clockwise from northeastern coast of island, 
t Volumes obtained from a single set of profiles in 1963. 
supplemented by aerial photographs and maps. 
Lanai), where the distribution of the beaches is 
skewed toward one particular area, the fluctua- 
tions of the total beach reservoir reflect quite 
clearly the fluctuating wind, wave, and current 
conditions. However, on other islands (e.g., 
Kauai and Oahu) with nearly 360-degree dis- 
tribution of beaches, erosion of the beaches 
along one coast may be accompanied by accre- 
tion of the beaches on the opposite side of the 
island due to the sheltering effects of the island 
itself. Under these conditions it is not possible 
to deduce the relationship between the beach 
reservoir and the meteorological and oceano- 
graphic conditions from the total island beach 
reservoir fluctuations. Individual beach sand 
reservoir changes must be studied. 
RATES OF ACCRETION AND EROSION IN 
beach sand reservoirs: As can be seen from 
Table 16, there are several beaches on Kauai, 
notably Lumahai, where the rates of beach 
erosion and accretion are on the order of sev- 
eral hundreds of cubic yards of sand per linear 
yard of beach per month. 
When the data are grouped according to 
island sectors, it can be seen that the effects of 
the winter storms are not the same in all island 
sectors (Fig. 5). Under Kona (southwesterly 
wind) conditions the northern beaches rapidly 
erode, but with the cessation of the westerly 
winds and the start of the northeast trades 
these same beaches rapidly accrete. The op- 
posite is true of the beaches in the southern 
sector. With the commencement of winter 
storms, Polihale, Kekaha, Waimea, and the 
TABLE 11 
Beach Sand Reservoirs, Selected Beaches, Maui 
BEACH* 
SAND volume, 
10 3 yd 3 
4/62 
6/62 
9/62 
2/63 
6/63 
9/63 
AVERAGE 
Hana 
23.8 
16.3 
22.6 
19.6 
18.2 
23.1 
20.6 
Hamoa 
32. 3f 
48.6 
47.0 
32.3 
31.0 
43.6 
39.1 
Puu Olai 
366.3 
364.1 
365.2 
526.9 
408.1 
364.1 
399.1 
Makena 
12.3 
23.0 
4.3 
9.6 
10.9 
7.6 
11.3 
Keawakapu 
44.1 
52.2 
60.3 
10.8 
48.6 
63.0 
46.5 
Kalama 
116.4 
109.3 
92.6 
95.0 
90.2 
104.5 
101.3 
Kihei 
294.2 
217.9 
188.0 
118.5 
226.1 
217.9 
210.4 
Maalaea 
250.6 
226.0 
191.8 
231.2 
194.5 
248.9 
223.8 
Olowalu 
264.0 
221.8 
209.4 
262.2 
169.0 
213.0 
223.2 
Makila 
2.4 
2.4 
2.2 
1.6 
1.6 
4.6 
2.5 
Hanakaoo 
85.5 
34.5 
25.5 
43.5 
22.5 
30.0 
40.3 
Kaanapali 
92. Of 
106.5+ 
101.2 
92.0 
106.5 
117.9 
102.7 
Napili 
28.6+ 
71.6 
51.9 
28.6 
48.6 
63.9 
48.9 
Fleming’s 
9-8+ 
4.6 
7.4 
9.8 
7.8 
8.8 
8.0 
Honokahua 
53.5 
66.5 
71.5 
57.5 
82.5 
59.5 
65.2 
Wai Paoko Kaio 
31.8 
45.2 
48.6 
48.6 
46.9 
46.9 
44.7 
Kahului Harbor 
104.0+ 
123.4 
76.6 
104.0 
92.9 
84.0 
97.5 
Kahului 
244.7 
202.2 
243.2 
326.8 
252.3 
310.1 
263.2 
Papaula 
148.4 
176.4 
165.9 
125.3 
149.1 
129.5 
149.1 
Paia 
44.2 
39.8 
44.2 
36.8 
42.0 
53.7 
43.0 
* Listed clockwise from eastern coast of island, 
f Assumed value. 
